We have not found a Daikin document that publishes one key to its part number formats, but in our own Daikin catalog the shape of the number sorts parts into clear groups. Of 802 active Daikin listings on our site (counted October 15, 2026), plain nine-digit numbers such as 668105601 are typically Daikin Applied (McQuay) applied-equipment and chiller parts, while seven-digit numbers such as 4009393 and numbers ending in J are typically Daikin AC, VRV and ductless service parts. The 25 listings under the vendor name Daikin are complete packaged units, listed by model number. Match the full part number to your unit's nameplate before ordering.
Which part number formats appear in our Daikin catalog?
Counts are active listings whose number has the format shown. "Typically" describes the product types and titles those listings carry on our site. It is our catalog data, not a Daikin definition.
| Number format | Active listings | In our Daikin catalog, typically | Example |
|---|---|---|---|
| Nine digits, often with a leading zero | 441 | Applied equipment and chiller parts. Largest types: sensors 56, gaskets and seals 55, hardware 46, motors 34, valves 25, control boards 20, filters 20. 128 start with 0. | 668105601 — Control Board Microtech Iii Wshp Main |
| Eight or nine digits plus a K or H suffix | 8 | Mixed: gaskets and seals 3, control boards 2, plus a blower wheel, a bracket and a motor | 056792401K — Mark IV DC Control Board |
| Q or P prefix | 10 | Wire harnesses 4, brackets and mounts 2, plus single hardware, valve and fan housing listings | Q263049018 — Harness Condensate Overflow (Float) |
| GC prefix | 8 | Shafts and couplings 5, blower wheels 2, one bearing | GC10677 — Blower Wheel 6.31" Dia 32 Blade |
| 4, three letters, then digits (4NKE7968 style) | 14 | Hardware 7 (nuts, screws, bushings, retainers), speed transformers 3, plus a blower wheel, a bearing, a freeze stat and a connector board | 4NKE7968 — Tinnerman Nut Replacement |
| Other formats: 11 digits, dashed numbers, E44 numbers, short alphanumerics | 17 | Mixed, including three gaskets, two crankcase heaters, two motors and two valves | 70-23641-82 — Motor Gas Heat Draft Inducer W/Gasket |
| Seven digits | 233 | Daikin AC, VRV and ductless service parts. Control boards 69, sensors 49, valves 33, motors 24, compressors 12 | 4009393 — Printed Circuit Board Replacement |
| Six digits plus a J suffix (also two with T or P) | 40 | The same kind of parts as the seven-digit group: sensors 7, valves 6, control boards 4, fuses 3, filters 3 | 128855J — Thermistor Assy |
| 2P or 3P prefix, dash, suffix | 4 | Control boards 3, one temperature sensor | 2P561243-1S — Control Board |
| Two short alphanumerics | 2 | A remote controller and an interface | BRC1H71W — Madoka Remote Controller |
| Model numbers (vendor Daikin) | 25 | Complete units: 17 packaged units and 8 heat pumps, listed by model number, not part number | Daikin DFG0603DH00001S Light Commercial Packaged Gas/Electric 5 Ton Replacement MPN |
These groups add up to all 802 listings: 777 parts under the vendor name Daikin Applied and 25 units under the vendor name Daikin.
How do I tell a Daikin Applied (McQuay) part from a Daikin AC part?
Start with the length of the number. In our catalog the 777 parts split into three groups, and the first split follows number format:
| Our collection | Listings | Number formats we see in it |
|---|---|---|
| Daikin Parts for Daikin Applied | 265 | Nine-digit numbers, including some K, H, Q, P, GC and 4xxx numbers |
| Daikin Parts for Daikin Chillers | 233 | Nine-digit numbers, mostly starting 330 to 336 and 735, including some K-suffix, dashed and 11-digit numbers |
| Daikin Parts for VRV Units | 279 | Seven-digit, J-suffix, 2P and 3P numbers, plus two short alphanumerics |
The 279 VRV listings match, count for count and type for type, the seven-digit, J, T, P, 2P and 3P numbers plus the two short alphanumerics above. Fifty of their titles say thermistor, and three name unit models directly: 2313966 — Expansion Valve Coil For RXYMQ36PVJU and 4020638 — Blower Motor Replacement For FTXB24AXVJU, with a thermistor for FTXB09/FTXB12 as the third. The valve listings in this group are mostly expansion, motorized, solenoid and four-way valve coils and bodies.
The nine-digit group is mixed. Its titles name MicroTech controls (six titles), water source heat pump boards (two titles use WSHP), Turbocor compressor kits (three titles) and pCO5+ controller boards (three titles), plus motors, blower wheels, filters, gaskets and fasteners. Numbers starting 735 lean chiller (44 of 45 are in our chillers collection), and so do numbers in the 330 to 336 range. Numbers starting 910 lean applied equipment (only 6 of 42 are in our chillers collection). That is a tendency in our listings, not a rule.
McQuay is not a separate number format in our catalog. The same Applied part can carry Daikin Applied, McQuay and Daikin McQuay names. Our guide Daikin Applied, McQuay, and Daikin-McQuay Part Numbers: Same Board, Three Names covers that overlap for control boards.
Do leading zeros and suffixes matter?
Yes. 128 of our 441 nine-digit numbers start with 0, and our listing titles keep the zero, such as 060006101 — Control Board MicroTech II AAH Main. Some web addresses drop the zero, so you may see 60006101 in a link and 060006101 on the part. Search both forms.
Suffixes and near-matches are separate listings. 056792404 — Mark IV AC Control Board and 056792401K — Mark IV DC Control Board differ in the last digits and the K. For the AC board's LED codes, see McQuay Mark IV Heat Pump Board LEDs: What Yellow, Green and Red Mean. 062218301 — Blower Wheel Plastic Pl 6 Inch D X 8 Inch W X .5 Inch B and 62218301K — 6" Diameter 7.8" Wide 1/2" Bore Wheel have different titles and different dimensions, so do not treat them as the same part. Likewise P112156601 — Shim Alum is a P-prefix listing, not a variation of a plain nine-digit number.
What does the nameplate show?
This is our practical advice, not a Daikin rule. The unit nameplate is more reliable than the part number for deciding which family you have:
| Nameplate or equipment type | Likely group in our catalog | Typical number format |
|---|---|---|
| Water source heat pump or fan coil with a MicroTech controller, or other Applied equipment | Daikin Applied (McQuay) applied equipment | Nine digits, such as 250803500 — Thermostat Fan Coil Bacnet |
| Chiller | Daikin Applied chillers | Nine digits, such as 331660622 — Control Board Pco5+ Low Speed Large and 735073629 — Gasket O-Ring .139Thk X 1.734 ID Buna |
| VRV or ductless model such as RXYMQ36PVJU or FTXB24AXVJU | Daikin AC, VRV and ductless | Seven digits or J suffix, such as 6024018 — Thermistor Assembly (M1, M2) and 065336J — Capacity Setting Adaptor |
| Light commercial packaged unit with a D-series model such as DFG0603DH00001S | Complete units, vendor Daikin | Model number, not a part number |
If a part number and the nameplate point to different groups, trust the nameplate and the full number on the old part, and ask us before ordering. Part numbers are sometimes superseded; see HVAC Part Number Supersessions: What They Mean and How to Avoid Ordering the Wrong Part.
Parts involved
| Component | Role in this issue | Where to find it |
|---|---|---|
| Applied equipment parts | Nine-digit numbers and their K, H, Q, P, GC and 4xxx relatives | Daikin Parts for Daikin Applied |
| Chiller parts | Nine-digit numbers, mostly starting 330 to 336 and 735 | Daikin Parts for Daikin Chillers |
| VRV and ductless service parts | Seven-digit, J-suffix, 2P and 3P numbers | Daikin Parts for VRV Units |
| All Daikin Applied listings | Every part under the Daikin Applied vendor name | Daikin Replacement Parts |
| Pressure transducers and sensors | Nine-digit sensors, the largest type in that group | 910153379 — Low Pressure Transducer Replacement |
Scope: This article describes the Daikin listings in our own catalog: 777 active products with vendor Daikin Applied and 25 with vendor Daikin, counted October 15, 2026, grouped by the format of the part number in each title, with the product type and title each listing carries on our site. It is not a Daikin definition, counts change as listings are added or retired, product types are our catalog's labels, and the example products are listed by live title, not as a fit confirmation for your unit.
Before you order
Read the model and serial number from the unit's nameplate and the full part number from the old part, including any leading zero and suffix. Our guide How to Find the Correct HVAC Replacement Part Using the Model and Serial Number covers the nameplate details. For more on the Applied range, see Daikin Applied Replacement Parts: OEM Parts for Chillers, Air Handlers & Commercial HVAC and, for a fault on a water source heat pump, Daikin Water Source Heat Pump MicroTech III LED Codes: What Each Light Means. To confirm fit, contact us at help@totalhvacparts.com or 302-219-4994 with the model, serial number and the full part number.
Frequently Asked Questions
What does a nine-digit Daikin part number mean?
We have not found a Daikin key to part number formats. In our Daikin catalog, plain nine-digit numbers (441 listings) are typically Daikin Applied (McQuay) applied-equipment and chiller parts, including MicroTech boards, motors, gaskets and sensors. Use the full number and match it to your model and serial number.
Are seven-digit Daikin part numbers for VRV or ductless units?
In our catalog, yes, typically. The 233 seven-digit listings, together with the J-suffix, 2P and 3P numbers, line up with our 279-listing VRV collection. The largest types are control boards (69), sensors (49), valves (33) and motors (24). Some titles name models such as RXYMQ36PVJU and FTXB24AXVJU.
Is a McQuay part number different from a Daikin Applied part number?
In our catalog, no. The same Applied number can be listed under Daikin Applied, McQuay and Daikin McQuay names. See our guide on the three names for control boards.
Does the leading zero matter in a Daikin part number?
Yes. 128 of our 441 nine-digit numbers start with 0, and the listing titles keep it. A number with the zero dropped, or with a K or H added, can be a separate listing with a different title, so search both forms and check the title against your part.
Sources
- Total HVAC Parts catalog data: 777 active Daikin Applied listings and 25 active Daikin listings, counted by part number format, product type, title and collection on October 15, 2026
- No Daikin document defining part number formats was found; the patterns above describe our listings only
- Live product titles for the parts listed above, as shown on each product page
Daikin heat pumps, VRV systems and chillers involve line voltage, stored charge in inverter board capacitors, pressurized refrigerant and rotating equipment. Service should be performed only by qualified personnel, following Daikin's documentation for your unit and your facility's lockout/tagout procedures.