An LG Multi V code is a 3- or 4-digit number on the outdoor unit's seven-segment display (and in LGMV). The last digit says which outdoor frame is reporting it (1 = master, 2 = slave 1, 3 = slave 2) and the leading digits are the error number, so 211 is CH21 on the master and 1051 is CH105 on the master. Heat recovery (HR) unit errors are followed by the HR unit number. This list follows the LG MULTI V 5 Outdoor Unit Service Manual (code tables pp.126-135, detailed entries pp.136-208) and, where marked, LG's older Multi V (ARUN series) service manual. It groups each code by subsystem with what to check first and the parts it points to.
How do you read an LG Multi V error code?
Per the Multi V 5 service manual, error codes are 3 or 4 digits. The rightmost digit identifies the outdoor unit frame (1 = master, 2 = slave 1, 3 = slave 2) and the remaining digits are the error number. LG's examples are 211 (Error No. 21 on the master) and 1051 (Error No. 105 on the master). Controllers label the same fault with a CH prefix, so a 213 on the display is CH21 on slave 2. After the error is resolved, the code disappears.
All codes can be viewed on the outdoor unit seven-segment display (SSD) and in LGMV software. An error from an indoor unit zone controller also shows in LGMV, on central controllers and on a BMS. HR unit errors are followed by the HR unit number (HR units 1 to 16 display as C01 to C16). CH230 and CH237 show only at the indoor unit and its wired remote, and CH238 shows there too.
The "Check first" column mixes LG's listed checks with plain practical order; where a number appears, it comes from the LG document named in that section. For where LG prints the tables and why third-party lists disagree, see where to find the LG Multi V error code table.
Which code range points to which system area?
| Code range | System area | Deep dive |
|---|---|---|
| CH01-CH11 | Indoor unit sensors, zone controller link, drain, mode conflict, EEPROM, fan motor | CH05 and CH53 communication errors |
| CH08, CH11-CH18, CH187 | Hydro kit | Hydro kit section below |
| CH21-CH29 | Inverter board, DC link, high pressure switch, input voltage, compressor start and overcurrent | CH21 IPM fault checks, CH26 and CH29 |
| CH32-CH36 | Discharge temperature, high and low pressure, compression ratio | Pressure and refrigerant section below |
| CH40-CH49 | Compressor CT sensor, discharge, pressure, ambient, heat exchanger, suction and IPM sensors | Outdoor sensors section below |
| CH50-CH53 | Phase loss, combination ratio, main-to-inverter and outdoor-to-indoor communication | CH05 and CH53 |
| CH57-CH65 | Main-to-inverter communication, inverter EEPROM, heat sink, liquid pipe sensor | Communication and inverter sections below |
| CH67-CH79 | Outdoor fan lock, CT sensor, overcurrent, start failure | Outdoor fan section below |
| CH86-CH87 | Main and fan PCB EEPROM | Configuration section below |
| CH104-CH107 | Master-to-slave communication, fan PCB communication, fan IPM, fan DC link | Communication and outdoor fan sections below |
| CH113-CH116 | Liquid pipe and subcooling sensors, oil level | Outdoor sensors section below |
| CH145-CH154 | External board communication, superheat, pressure difference, heat exchanger sensors | Pressure and refrigerant section below |
| CH182-CH194 | Main and sub MICOM communication, hydro kit freeze protection, fan heat sink | Communication and outdoor fan sections below |
| CH200-CH206, CH242 | Heat recovery unit and central controller network | HR and network section below |
| CH230-CH238 | Refrigerant leak sensor, RS-485 indoor-to-outdoor link | Newer indoor-unit codes section below |
Indoor unit codes (CH01 to CH11)
Table 68 and the detailed entries in the Multi V 5 manual (pp.126-142). The thermistor values and the drain pump voltage are from LG's older Multi V (ARUN series) service manual, because the Multi V 5 entry pages point to a resistance chart without printing the figures.
| Code | Meaning | Check first | Parts it points to |
|---|---|---|---|
| CH01 | Indoor unit return air (or optional remote wall) temperature sensor (communications) error | Connector at CN-ROOM, then sensor resistance. LG's older manual gives the air sensor as 10 kΩ at 25°C (77°F), flags an error above 100 kΩ (open) or below 100 Ω (short), and treats a reading within ±5% of the chart as normal. If the sensor is right, the indoor PCB is next. | LG EBR79004805 Main PCB Assembly – Multi V indoor unit |
| CH02 | Indoor unit inlet pipe temperature sensor (communication) error | Connector at CN-PIPE IN (CN-PIPE1 in the older manual). Older manual: pipe sensor 5 kΩ at 25°C (77°F), same open and short limits. | Indoor main PCB, as above |
| CH03 | Communication error between zone controller and indoor unit. In the Multi V 5 manual (p.137) the indoor PCB has not received a signal from the zone controller. LG's older manual words it both ways: its code table says the indoor PCB did not receive the wired remote's signal, and its Error 03 flowchart says the remote did not receive the indoor unit's signal. | Plug a controller straight into the indoor PCB (CN-REMO). If the error does not return after several minutes, replace the cable. Check connections and cable extensions, and keep the communication cable away from main power wiring. After replacing the indoor PCB, run auto addressing and re-enter the unit address if there is a controller. | Indoor main PCB, as above |
| CH04 | Indoor unit drain overflow | Drain pan level (float is half-way up the float switch), whether the drain pump runs or is clogged, float switch resistance, PCB output voltage, drain head height and slope. The older manual's flowchart asks whether the drain pump terminal shows 220 V output (older manual flowchart figure). If the float rises above half its height the circuit opens and the unit stops. | Drain pump and float switch: LG Parts |
| CH06 | Indoor unit outlet pipe temperature sensor error, or hydro kit liquid-side sensor error | Connector at CN-PIPE OUT (CN-PIPE2 in the older manual) and resistance, as for CH02. For a hydro kit, check the liquid-side temperature sensor. | Indoor main PCB, as above |
| CH07 | Indoor units not operating in the same mode (heat pump applications only) | Compare the operating mode set on each indoor unit on the system. | None; a settings issue first |
| CH09 | Indoor unit EEPROM error: EEPROM serial number reads 0 or FFFFFF, MICOM-to-EEPROM communication fault, or damaged EEPROM | LG's remedy is to replace the indoor PCB, run auto addressing and enter the central control address. | Indoor main PCB, as above |
| CH10 | Indoor BLDC fan motor communication error; feedback signal absent for at least 50 seconds | With power off, check the fan motor connection to the PCB, then whether the motor runs normally. If it does, replace the indoor PCB and run auto addressing. LG's entry includes a Hall sensor resistance test at the motor connector. | LG EAU64382902 DC Fan Motor, Indoor – Multi V indoor unit |
| CH11 | Multi V 5: hydro kit communication error with the inverter compressor PCB. Older Multi V manual: transmission error between the indoor unit and the outdoor main PCB, raised when the addressing signal does not respond for 3 minutes. | Multi V 5: hydro kit communication wiring. Older systems: communication wiring and auto addressing. | LG Parts |
Outdoor sensor and thermistor codes
These come from Tables 70 to 76 and the detailed entries on pp.160-162, 173 and 190-199 of the Multi V 5 manual. The usual LG sequence is: check the sensor connection on the outdoor PCB, check the thermistor for a short or open, then compare the resistance with LG's chart. The tolerance LG quotes is ±5%. The outdoor unit sensor labels are TH1 (outdoor temperature), TH2 (pipe) and TH3 (discharge pipe).
| Code | Meaning | Check first | Parts it points to |
|---|---|---|---|
| CH41 / CH47 | Inverter compressor 1 / compressor 2 discharge pipe temperature sensor (TH3) disconnected or shorted | TH3 installed and connected, resistance, and the temperature LGMV shows. The error can also appear in cooling at extremely low temperatures with no low ambient kit. | LG EBG61107412 NTC Thermistor Assembly – Multi V 5 outdoor unit |
| CH42 / CH43 | Outdoor unit low / high pressure sensor error (disconnected or shorted) | Connection at the outdoor PCB, then supply and signal-to-ground readings against LG's pressure chart. LG lists the sensors as low 0-2 MPa and high 0-5 MPa, output 0.5-3.5 V (±5%) on a 5 V DC supply. | LG EBD64386504 Pressure Sensor – Multi V 5 outdoor unit |
| CH44 | Outdoor unit ambient air temperature sensor error | Connection, thermistor short or open, signal to ground against LG's chart. | Thermistor, as above |
| CH45 | Outdoor unit heat exchanger pipe temperature sensor error | Connection on the outdoor PCB, thermistor short or open. | Thermistor, as above |
| CH46 | Outdoor unit suction pipe temperature sensor error | Check the suction sensor in cooling, or the hot gas sensor near the heat exchanger in heating. Can also occur in cooling at extremely low temperatures with no low ambient kit. | Thermistor, as above |
| CH49 | Outdoor unit IGBT / IPM temperature sensor error | Connection on the outdoor PCB, thermistor short or open; the outdoor PCB itself is listed as a cause. | Thermistor, as above |
| CH65 | Conflict inside LG's manual: the code table calls it an inverter heat sink temperature sensor error; the detailed entry calls it the outdoor unit liquid pipe (condenser) temperature sensor error. See the conflicts section. | Check both sensors' connections and resistance, then the outdoor PCB. | Thermistor, as above |
| CH113 / CH114 / CH115 | Outdoor unit liquid pipe (condenser) / subcooling inlet / subcooling outlet temperature sensor error | Connections, resistance (±5%), then the outdoor PCB. | Thermistor, as above |
| CH116 | Low oil level, or oil level sensor error (master); oil level sensor error (slaves) | The oil level sensor connection, and whether the unit is actually low on oil. | LG Parts |
| CH153 / CH154 | Upper / lower heat exchanger temperature sensor error | Sensor connection, sensor value, then the outdoor main PCB. | Thermistor, as above |
| CH194 | Outdoor unit fan heat sink temperature sensor error | Connection, resistance, then the outdoor PCB. See CH193 for the overheat side. | Thermistor, as above |
Communication codes
The CH05 and CH53 flowcharts are covered in LG CH05 and CH53: which board or wire?. CH52 and CH57 look alike but run in opposite directions: in CH52 the main PCB is not receiving the inverter PCB, in CH57 the inverter PCB is not receiving the main PCB.
| Code | Meaning | Check first | Parts it points to |
|---|---|---|---|
| CH05 | Communication error between outdoor PCB and indoor PCB: the indoor PCB has not received the outdoor PCB's signal for more than 5 minutes (Multi V 5 manual p.140) | Auto addressing done, communication cable connected and not shorted, power and communication wiring separated, T-phase connection. LG's test: DC voltage across the indoor unit's A and B terminals fluctuating within -9 V to +9 V means the outdoor signal is normal. | LG EBR79669907 Main PCB Assembly – Multi V 5 outdoor unit, LG EBJ61631013 Transformer – Multi V 5 outdoor unit |
| CH52 | Outdoor main PCB cannot receive the signal from the inverter compressor PCB | Yellow communication LED on the inverter PCB, communication cable, main PCB, then the noise filter and the inverter PCB line fuse. A blinking communication LED is the normal-operation sign. | LG EAM37641502 Line Noise Filter – Multi V outdoor unit |
| CH53 | Outdoor main PCB cannot receive the signal from the indoor unit(s) | Power to the indoor PCB, communication cable connections, indoor unit count and communication count in LGMV, duplicate indoor addresses, the communication PCB LED, then the main PCB. | Outdoor main PCB, as above |
| CH57 | Outdoor inverter PCB is not receiving a signal from the main PCB | Connection between main and inverter PCB, communication wire noise, reset power and see whether it returns, then each PCB. | LG EBR88279008 Inverter PCB Assembly – Multi V 5 outdoor unit |
| CH104 | Communication error between the master and slave outdoor units | Communication cable, slave DIP switch settings, main PCB power, shielded wiring, GND wire to the chassis, A and B not swapped, then the main PCB. | Outdoor main PCB, as above |
| CH105 | Fan PCB did not receive a signal from the inverter compressor PCB | Yellow communication LEDs on both PCBs, the cable between them, fan PCB power, and power to the inverter 1 and inverter 2 terminals on the main PCB (LG flags below 13.5 V DC). | LG EBR88279203 Fan PCB Assembly – Multi V 5 outdoor unit |
| CH145 | Outdoor main board cannot receive the external PCB's signal | Power wiring and communication cable, the external PCB's yellow communication LED, main PCB. | Outdoor main PCB, as above |
| CH182 | Communication error between the external board's main and sub MICOMs | Yellow communication LED between the MICOMs, then the reset button, before replacing the external PCB. | LG Parts |
Inverter and compressor codes
Pages 144-159 and 171-175 of the Multi V 5 manual. CH21, CH26 and CH29 have their own articles with the IGBT, diode and 15 V checkpoints: CH21 and CH26 and CH29.
| Code | Meaning | Check first | Parts it points to |
|---|---|---|---|
| CH21 | Inverter board IPM fault: overcurrent in any one compressor phase, seen by the CT sensor on the IGBT PCB | R/S/T wiring, compressor winding and insulation, inverter U-V-W and DC link connections, heat sink connections, then the board. LG's IGBT and diode check readings are listed at 0.38 V to 0.7 V, and the 15 V supply at 14.5 V to 15.5 V. | LG EBR88279008 Inverter PCB Assembly – Multi V 5 outdoor unit |
| CH22 | Inverter PCB AC input overcurrent (RMS): three-phase input current above 22 A | Overload (clogged pipe, bad EEV, blocked unit, overcharge), compressor motor and insulation, input voltage, power wiring, then the inverter PCB current sensor. | Inverter PCB, as above |
| CH23 | Low or high DC voltage at the inverter compressor DC link. LG lists a trip below 50 V, or above 550 V (208-230 V units) or 1,000 V (460 V units), for at least 250 μs. | Start at the inverter socket on the noise filter PCB; check the DC link connection, a failing capacitor, the bridge diode and input voltage (220 V ±15% or 460 V ±15%). | LG EAM37641502 Line Noise Filter – Multi V outdoor unit |
| CH26 | Inverter compressor start failure | Overload, compressor insulation and winding, compressor wiring, inverter PCB. LG's cross-connection check (Two Compressor Additional Check Procedure, same-capacity inverters only) shows compressor versus board. | LG TBZ37416201 Compressor, JQC068MBA Inverter Scroll – Multi V 5 208/230V |
| CH28 | Older Multi V (ARUN series) manual only: inverter DC link high voltage; system turned off by DC voltage overcharging | The Multi V 5 manual folds high DC link voltage into CH23. On an older unit, check input voltage and the inverter board. | Inverter PCB, as above |
| CH29 | Inverter compressor overcurrent: input current above 30 A | Overload, compressor insulation, input voltage (R-S, S-T, T-R outside 180-253 V on 208-230 V units, or 414-528 V on 460 V units), then the inverter PCB. | LG TBZ37416101 Compressor, JQC048MBA – Multi V 5 outdoor unit |
| CH40 | Inverter compressor CT sensor error: sensor disconnected or shorted, or MICOM input outside 2.5 V ±0.3 V at power-up | Power wiring, input voltage (208-230 V ±10%, or 414-528 V for 460 V), then the inverter PCB. | Inverter PCB, as above |
| CH60 | Inverter PCB EEPROM error: bad contact or insertion, different EEPROM version, or damaged inverter PCB | EEPROM insertion direction, EEPROM check sum, then the inverter PCB. Turn power off before replacing the EEPROM. | Inverter PCB, as above |
| CH62 | High temperature at the inverter heat sink: above 257°F (about 125°C) | IGBT / IPM connection, outdoor fan motor operation, overload (clogged pipe, blocked fan, EEV, overcharge), then the inverter PCB. Apply heat transfer paste to a new board's heat sink. | LG RAC34537401 Heat Transfer Paste for Inverter PCB & Heat Sink Service |
| CH71 | Conflict inside LG's manual: the code table says inverter CT sensor error; the detailed entry says outdoor unit converter CT sensor error. See the conflicts section. | R-T input voltage (208-230 V ±10%, or 414-528 V), wiring and the noise filter, then the converter PCB. | Inverter PCB, as above |
| CH73 | Older Multi V (ARUN series) manual only: instant (peak) overcurrent at the outdoor unit PFC | Not in the Multi V 5 manual's tables; for an older unit use LG's manual for that model. | LG Parts |
Pressure and refrigerant codes
Pages 149 and 155-158 and 191-195 of the Multi V 5 manual.
| Code | Meaning | Check first | Parts it points to |
|---|---|---|---|
| CH24 | System turned off by the outdoor unit high pressure switch (excessive discharge pressure; LG's flowchart asks whether it is above 2,500 kPa at the manifold gauge) | Switch connected to the main PCB and not shorted, service valve open, indoor and outdoor fans, compressor check valve, overcharge, EEV, blockage, then the sensor against the manifold reading. | LG EBF40271416 Pressure Switch – Multi V 5 outdoor unit |
| CH32 / CH33 | Compressor 1 / compressor 2 discharge gas temperature too high: discharge pipe above 115°C (239°F) for 10 seconds, or compressor dome at 105°C (221°F) for 10 seconds | Refrigerant amount, discharge sensor resistance, EEV operation, strainer clogging, leaks, liquid spray valve. | LG EBG61107412 NTC Thermistor Assembly – Multi V 5 outdoor unit |
| CH34 | Compressor high pressure safety tripped: one compressor above 4,000 kPa (580 psi) for 10 seconds, and LG says the system shuts off after 10 consecutive occurrences | Service valve open, refrigerant amount, fans (indoor in heating, outdoor in cooling), blocked coil or filter, then the high pressure sensor against the manifold gauge. | LG EBD64386504 Pressure Sensor – Multi V 5 outdoor unit |
| CH35 | Low side pressure below allowable limits. LG's triggers: below 110 kPa for 1 minute when total inverter frequency is under 30 Hz; in cooling below 400 kPa for 1 minute with high side under 2,200 kPa; in heating below 230 kPa for 1 minute with high side under 1,800 kPa. Shutdown after three consecutive occurrences. | Service valve, piping damage or a leak, refrigerant amount, fans, strainer clogging, then the low pressure sensor against the manifold gauge. | Pressure sensor, as above |
| CH36 | Inverter low compression ratio. LG's triggers: below 1.6 for 2 to 5 minutes after a reversing valve change (LG waits 5 minutes first); in low ambient cooling, below 1.1 for 2 minutes or below 1.3 for 3 minutes. | LG lists a compressor lift problem, poor reversing valve operation, and a direct connection between the low and high pressure vapor pipes (especially a reversed Y-branch connection). | LG 5220A20039A Reversing Valve – Multi V 5 outdoor unit |
| CH150 | Compressor discharge superheat not satisfied (below 3°C, 4.8°F, for 5 minutes); cooling only, with a risk of liquid floodback | Indoor EEV connection and coil, compressor EEV, liquid and vapor piping connections, any large refrigerant leak. Three occurrences in 1 hour of compressor operation leave the system off until a manual restart. | LG EAP65270715 Expansion Valve Coil – Multi V outdoor unit |
| CH151 | Pressure difference between high and low side too low; LG attributes it to the four-way reversing valve (sludge or inflow), a defective valve or a compressor problem | Valve connector at the main PCB (4way, CN09), coil resistance and seating, and an output of 230 V AC at the socket during heating. On three-frame systems LG closes the service valves and compares each unit's pressure difference in LGMV. | LG EAP64467706 Reversing Valve Coil – Multi V outdoor unit |
Outdoor fan codes
Pages 174-179, 187-189 and 198 of the Multi V 5 manual.
| Code | Meaning | Check first | Parts it points to |
|---|---|---|---|
| CH67 | Outdoor unit fan locked up (no airflow) | Fan motor assembly and U-V-W wiring, phase and insulation resistance, rotation reversing after the RPM target is reached, fan PCB, and heavy snowfall blocking the fan. | LG EAU43080032 DC Fan Motor, Outdoor – Multi V 5 outdoor unit |
| CH75 | Outdoor fan CT sensor error: MICOM offset outside 2.5 V ±0.3 V because fan motor phase current is out of range | The 15 V DC input power (LG lists input not at 15 V as a cause and checks the 15 V supply on the inverter compressor PCB), power wiring, then the fan PCB and inverter PCB. | LG EBR88279203 Fan PCB Assembly – Multi V 5 outdoor unit |
| CH77 | Outdoor fan overcurrent: fan current above 10 A (208-230 V units) or 5 A (460 V units) | Overload, an iced or blocked condenser, motor resistance and insulation, motor connector inserted, fan PCB. | Fan motor and fan PCB, as above |
| CH79 | Outdoor fan operation failure: first position sensor failure | Motor assembly and U-V-W output, phase and insulation resistance, fan PCB and its IPM. | Fan motor and fan PCB, as above |
| CH106 | Fan IPM error: the IPM overcurrent protection circuit activated | Overload, fan motor winding and insulation, U-V-W connections, the fan PCB and heat sink assembly, and the 13.5 V DC supply LG names. | Fan PCB, as above |
| CH107 | Fan DC link low voltage. LG's detail page lists below 140 V (208-230 V units) or below 380 V (460 V units); the code table lists below 50 V for at least 250 μs. | Wiring between inverter and fan PCB, reactor terminal contact, DC link terminals, bridge diode, a failing capacitor. | Fan PCB, as above |
| CH193 | Excessive increase in fan PCB heat sink temperature: above 194°F on LG's detail page (p.198); the code table (p.134) prints above 203°F | Fan PCB IPM connection, fan motor operation, overload (clogged pipe, blocked fan, EEV, overcharge). | Fan PCB, as above |
Power supply codes
| Code | Meaning | Check first | Parts it points to |
|---|---|---|---|
| CH25 | Outdoor unit input voltage too high or too low: below 180 V or above 253 V on 208-230 V units, below 414 V or above 528 V on 460 V units | R(L1), S(L2), T(L3) wiring, R-S, S-T and T-R phase voltage, phase bridge diode and IGBT connections, then the inverter PCB. | Inverter PCB, as above |
| CH50 | Loss of phase: one or more of R(L1), S(L2), T(L3) missing at the outdoor unit | Input voltage and wiring, R-S, S-T, T-R at 208-230 V ±10% (or 414-528 V), main PCB, noise filter and wiring, then the inverter PCB current sensor. LG notes a changed color on the R-phase terminal as a sign. | Noise filter, as above |
Installation and configuration codes
| Code | Meaning | Check first | Parts it points to |
|---|---|---|---|
| CH51 | Combination ratio out of range: total nominal indoor capacity under 50% or over 130% of the outdoor unit's nominal capacity | Total indoor capacity on the LGMV report, installed indoor units against LGMV data, slave DIP switches, slave PCB power, and the cables between master and slaves. A failed master main PCB that cannot see the slave can also raise it. | None until the capacity and wiring check out |
| CH86 / CH87 | Outdoor main PCB onboard EEPROM error / fan PCB EEPROM error | EEPROM present and seated, all pins in and unbent, notch lined up with the socket arrow, check sum. Turn power off before replacing an EEPROM. | Main PCB and fan PCB, as above |
Heat recovery (HR) unit and network codes
Pages 135, 165 and 201-208 of the Multi V 5 manual. HR codes are followed by the HR unit number.
| Code | Meaning | Check first | Parts it points to |
|---|---|---|---|
| CH51 with HR unit number (shown as 512) | Indoor capacity on an HR branch exceeds the limit: over 54 MBh on a single port or on unique ports, over 108 MBh on two twinned ports, over 162 MBh on three same-address ports, over 192 MBh per HR unit | Wait 5 minutes after auto pipe detection, then verify connected capacity. LG also lists more than eight indoor units on one branch pipe, wrong cables or piping, and a bad outdoor or HR PCB. | LG Parts |
| CH200 | Auto pipe search failure: the auto piping procedure did not complete properly | Green communication LED on the HR unit, power and communication cable to it, indoor addresses after auto addressing, HR rotary and DIP switches. By default CH200 is a Level 1 response (shutdown, manual restart); LG's Table 48 setting can change it to Level 3. | LG Parts |
| CH201C / CH202C / CH203C | HR unit liquid pipe / subcooling inlet / subcooling outlet temperature sensor error | Sensor and lead cable connections. LG's entry ends at the outdoor PCB if sensor connection and values are correct. | LG Parts |
| CH204C | Outdoor unit does not receive a signal from the HR unit | Power wiring and communication cable, green LED blinking, rotary and DIP switches, then reset power at the outdoor and HR units. LG says an HR communication error cannot clear until outdoor power is reset. If CH59 shows on the HR unit with CH204 on the outdoor unit, LG says the outdoor software has not been upgraded for 3A HR units. | LG Parts |
| CH205C | Communication error between a 2A Series HR unit and the 485 modem; shows when no signal arrives for 3 minutes | Cable to the modem and the modem's red LED. A flashing red LED means replace the 485 modem; if it still flashes, the HR PCB. | LG Parts |
| CH206C | Duplicate address on a 2A Series HR unit (485 communication) | Set each HR unit's rotary switch differently, reset the outdoor unit, power-cycle the HR unit, and run auto addressing again. | LG Parts |
| CH242 | Network error of the central controller: it cannot receive information from the outdoor unit | RS-485 wiring, the remote controller to indoor unit link, RS-485 DIP switch setting, repeated indoor unit addresses on the central controller. | None; a wiring and settings check |
Hydro kit codes
Table 68, 69 and 76 of the Multi V 5 manual (pp.126-127, 134, 197). These apply only where a hydro kit is connected.
| Code | Meaning | Check first | Parts it points to |
|---|---|---|---|
| CH08 | Hydro kit hot water storage tank temperature sensor error | The tank sensor and its connection (disconnected, shorted or open). | LG Parts |
| CH12 | Hydro kit inverter compressor PCB error | Hydro kit PCB; see CH11 for the communication side. | LG Parts |
| CH13 | Hydro kit solar heat pipe temperature sensor error | Sensor connection and resistance. | LG Parts |
| CH14 | Hydro kit flow switch error | The flow switch and its connection. | LG Parts |
| CH15 | Hydro kit leaving water temperature has exceeded 185°F (85°C) | Leaving water sensor, and whether hot water is flowing in. | LG Parts |
| CH16 / CH17 / CH18 | Hydro kit water pipe and ambient sensor / inlet pipe (and outside air duct inlet pipe) sensor / outlet pipe sensor communication errors | The named sensor's connection and resistance (disconnected, shorted or open). | LG Parts |
| CH187 | Hydro kit freeze protection error: inlet water below 5°C (41°F) raises it as a Level 3 response, or the water outlet temperature sensor is disconnected or shorted | Water temperature sensors and water flow. LG notes the protection does not cover the heat exchanger if glycol is inadequate or if the hydro kit is off. | LG Parts |
Newer indoor-unit codes: leak sensor and RS-485 link (CH230, CH237, CH238)
These three are listed in the Multi V 5 manual (p.127 and the entries on pp.206-207) and appear at the indoor unit and its wired remote (CH230 and CH237 only there).
| Code | Meaning | Check first | Parts it points to |
|---|---|---|---|
| CH230 | Refrigerant leak sensor error: the sensor is malfunctioning, or the leak function is enabled on the wired remote with no sensor installed. LG lists a leak as detected above 6,000 ppm. | The sensor and the function code setting. A sensor reading under 1.5 V is treated as normal and the buzzing stops. On a trip, operation stops, the indoor-side solenoid valve closes and CH230 shows; LG says power must be reset to clear it. | LG Parts |
| CH237 | Communication error between the outdoor and indoor PCBs: the indoor communications PCB gets no signal from the outdoor communications PCB for over 3 minutes (check RS-485) | Outdoor unit powered, auto addressing completed without errors, communication cable and connections, outdoor communication module installed and connected. | LG EBR79004805 Main PCB Assembly – Multi V indoor unit |
| CH238 | Communication error between the outdoor and indoor PCBs, worded the same way as CH237 (no signal for over 3 minutes) | The same order as CH237, ending at the outdoor unit communication PCB. | Indoor main PCB, as above |
What do the Multi V 5 severity levels mean?
LG's service manual (p.125) ranks responses from "notify and keep operating" (Level 4) to "immediate system shutdown" (Level 1). The system starts any non-communication fault at Level 3.
| Level | What the system does |
|---|---|
| Level 4 | Shows the code and keeps operating. The code stays until the master outdoor unit's microprocessor is reset and the system has run for 130 minutes without the fault returning. |
| Level 3 | Shuts down for 3 minutes, then the master restarts the system automatically. If the fault returns up to nine times in an hour the cycle repeats; a tenth occurrence in the same hour becomes a Level 1 shutdown. |
| Level 2 | Communication errors only, activating after ten failed communication attempts and clearing when communication returns. Time limits: outdoor PCB to outdoor PCB, none; indoor to outdoor unit, 3 minutes; indoor unit to HR unit, 10 seconds; outdoor unit external PCBs, 10 seconds. |
| Level 1 | Many cause an immediate shutdown once the system confirms the fault is real. A manual restart is required and the code cannot clear until the cause is fixed. |
What are the FDD E01 to E10 codes?
The Multi V 5 FDD checklist (p.57) lists result codes E01 to E10, which appear on the master outdoor unit's main PCB display during the FDD test run. We could confirm E01 only: the indoor unit combination capacity is above 130% or below 80% of the outdoor unit's rated capacity. That is a different window from the 50% to 130% CH51 uses in normal operation. The page's layout does not let us line up the other nine meanings with their codes, so we do not list them; use the manual's table.
Where do LG's documents conflict, and what is not covered?
- CH05 across generations. LG's Multi V 5 manual and its older Multi V (ARUN series) manual agree: CH05 is the indoor PCB failing to receive the outdoor unit's signal. If you read a list that words CH05 as the outdoor unit not hearing the indoor unit, that wording matches CH53, which LG defines as the outdoor main PCB being unable to receive the indoor unit's signal.
- CH65. The Multi V 5 code table (p.131) calls it an inverter heat sink temperature sensor error; the detailed entry (p.173) calls it the outdoor unit liquid pipe (condenser) temperature sensor error and cross-references CH113. LG's older manual lists it as a heat sink temperature sensor error. Check both sensors.
- CH71. The code table says inverter CT sensor error; the detailed entry (p.175) says outdoor unit converter CT sensor error, with R-T input voltage and the converter PCB as the checks.
- CH03. Multi V 5 words it as the indoor PCB not receiving the zone controller. LG's older manual is inconsistent: the error table matches that direction, but its Error 03 flowchart describes the remote not receiving the indoor unit's signal.
- CH34 and CH35. LG's detail pages give 10 consecutive occurrences for CH34 and three for CH35. Lists that give three for both do not match the Multi V 5 entry for CH34.
- CH193. LG's detail page (p.198) gives above 194°F for the fan PCB heat sink; the code table (p.134) prints above 203°F.
- CH237 and CH238. LG's entries for both describe the indoor communications PCB receiving no signal from the outdoor communications PCB for over 3 minutes, with nearly identical check lists.
- Not covered. The Multi V 5 manual's code tables end at CH242. We have no LG definition for codes above CH242, and we left out codes the Multi V 5 tables do not list, such as CH54, CH59 (beyond the HR note under CH204C) and CH76.
Parts involved
Scope: This article covers the error code tables and detailed entries of the LG MULTI V 5 Outdoor Unit Service Manual (pp.125-209), plus the Multi V (ARUN series) service manual where marked. Multi V S, Multi V Water and single-zone or multi-split products use different tables, so confirm the code in the manual for your unit. The parts above are examples listed by live product title, not a fit confirmation for your unit.
Before you order
Read the model and serial number from the nameplate of the unit that shows the code, and note which frame digit it shows. For matching LG part number prefixes to part types, see what LG part number prefixes mean, and browse LG Parts. To confirm fit, contact us at help@totalhvacparts.com or 302-219-4994 with the model, serial number, the full code as displayed and which units show it.
Frequently Asked Questions
What does the last digit of an LG Multi V error code mean?
It identifies the outdoor unit frame: 1 is the master, 2 is slave 1 and 3 is slave 2, per the LG Multi V 5 service manual. The leading digits are the error number, so 211 is error 21 on the master and 1051 is error 105 on the master.
What is the difference between CH05 and CH53 on an LG Multi V?
CH05 means the indoor unit PCB has not received the outdoor unit PCB's signal for more than 5 minutes. CH53 means the outdoor main PCB cannot receive the indoor unit's signal. Both are indoor-to-outdoor communication errors reported from opposite ends; see LG CH05 and CH53: which board or wire?
Which LG Multi V error codes shut the system down?
Level 1 responses shut the system down and need a manual restart. Level 3 faults shut it down for 3 minutes and then restart it automatically, and become Level 1 on the tenth occurrence in one hour. Level 4 only displays the code and keeps running.
What does CH230 mean on an LG Multi V indoor unit?
It is a refrigerant leak sensor error shown at the indoor unit and its wired remote: the sensor is malfunctioning, or the leak function is enabled with no sensor installed. LG treats a sensor reading under 1.5 V as normal, and says power must be reset to clear the error.
Sources
- LG MULTI V 5 Outdoor Unit Service Manual, LG Electronics U.S.A., Error Code General Information (p.125), Error Code Tables (pp.126-135), error entries (pp.136-208), FDD Checklist (p.57), cited by name and page; not linked
- LG Multi V (ARUN series) service manual, Troubleshooting Guide error tables for Error Nos. 01 to 06 and the outdoor code tables, cited by name; not linked
- Live product titles for the parts listed above, as shown on each product page
LG Multi V systems involve line voltage, stored charge in inverter board capacitors, pressurized refrigerant and rotating equipment. Service should be performed only by qualified personnel, following LG's service manual for your unit and your facility's lockout/tagout procedures.