Stock photo — may not be the exact part. Verify by part number before ordering.LG MJX63991801 Expansion Valve Body – Multi F and mini split system
Not sure it's the right part? Check it against your unit or send us the model and serial — help@totalhvacparts.com or 302-219-4994.
Overview
LG MJX63991801 is the genuine LG expansion valve body for LG Multi F and mini split systems. LG lists it for 34 models across Multi F and mini split systems, including A4UW30GFA3, AUUW09GA2 and LMU303HV. LG lists 5401495201 as interchangeable with MJX63991801 — if your old part carries that number, MJX63991801 is the current part.
Check the model number on your unit's rating plate against the fit list on this page before ordering.
Fits These LG Units
LG lists MJX63991801 for the models below. Enter your model and serial in the fit checker to confirm against LG's service notices.
A2UW models
- A2UW18GFA1
- A2UW18GFA3
- A2UW18GFH0
A3UW models
- A3UW24GFA1
- A3UW24GFA3
- A3UW24GFH0
A4UW models
- A4UW30GFA0
- A4UW30GFA3
- A4UW30GFH0
- A4UW36GFA3
AUUW models
- AUUW09GA2
- AUUW12GA2
HM12 models
KPHT models
KUMX models
KUSU models
KUSX models
LAU0 models
LAU1 models
LMU1 models
LMU2 models
LMU3 models
LSU0 models
LSU1 models
LUU0 models
LUU1 models
S4UW models
- S4UW09JLRDA
- S4UW09K21FA
- S4UW12JLRDA
- S4UW12K21FA
Z2UR models
- Z2UR18GFH0
Z3UR models
- Z3UR24GFH0
Z4UR models
- Z4UR30GFA0
- Z4UR30GFH0
- Z4UR36GFA0
ZHBW models
- ZHBW041GA0
- ZHBW048GA0
- ZHBW055GA0
- ZHBW126A0
ZNUR models
- ZNUR18GA1
ZUUR models
- ZUUR24GE0
- ZUUR30GE0
Specifications
After You Order
Order number and confirmation by email the moment you check out.
In stock - ships the same or next business day, Monday–Friday. Tracking follows by email the moment it leaves.
Tracking number lands in your inbox the moment it leaves the building.
Check the part number on the label against your order before installing. Wrong or damaged? Tell us — we'll sort it out.
Ask the Parts Desk
Not sure this fits? Need more than what's in stock? Send the model and serial from the unit's data plate — a real person reads it and confirms before you order.
Common Questions
What LG models does MJX63991801 fit?
LG lists MJX63991801 for: A2UW18GFA1, A2UW18GFA3, A2UW18GFH0, A3UW24GFA1, A3UW24GFA3, A3UW24GFH0, A4UW30GFA0, A4UW30GFA3, A4UW30GFH0, A4UW36GFA3, AUUW09GA2, AUUW12GA2, HM121M, KPHTC411M, KPHTC481M, KPHTC551M, KUMXA181A, KUMXA241A, KUMXA301A, KUMXB301A, KUMXB361A, KUSUB181A, KUSXE241A, KUSXE301A, LAU090HYV3, LAU120HYV3, LMU180HHV, LMU183HV, LMU240HHV, LMU243HV, LMU24CHV, LMU300HHV, LMU303HV, LMU30CHV, LMU363HV, LSU090HSV5, LSU120HSV5, LUU090HV, LUU120HV, S4UW09JLRDA, S4UW09K21FA, S4UW12JLRDA, S4UW12K21FA, Z2UR18GFH0, Z3UR24GFH0, Z4UR30GFA0, Z4UR30GFH0, Z4UR36GFA0, ZHBW041GA0, ZHBW048GA0, ZHBW055GA0, ZHBW126A0, ZNUR18GA1, ZUUR24GE0, ZUUR30GE0. Use the fit checker on this page with your model and serial to confirm against LG's service notices.
What part numbers are interchangeable with MJX63991801?
LG lists 5401495201 as interchangeable with MJX63991801. If the part in your unit carries any of those numbers, MJX63991801 is the current part.
Is the stock number on this page real?
Yes. The stock line on this page comes from LG's parts stock feed plus our own warehouse count, not an estimate. "In Stock - Ships Same or Next Business Day" means MJX63991801 is on hand and leaves within one business day of your order, Monday–Friday.
Is this a genuine LG part, or aftermarket?
Genuine LG OEM equipment sourced through LG's authorized parts program — not an aftermarket substitute.
How do I confirm this fits my unit?
Match part number MJX63991801 to your unit's parts diagram. If unsure, send us your model and serial number and we'll verify before you order.
What's the warranty on this part?
Warranty terms vary by manufacturer. Contact us with your order number for details specific to this part.
How fast does this ship?
MJX63991801 ships the same or next business day, Monday–Friday, with tracking by email. Standard ground delivers to most of the continental US in 2–5 business days.
Does everything ship UPS or FedEx Ground?
Most orders ship UPS or FedEx Ground. A small number of large or heavy parts across the catalog ship by truck freight instead, and we reach out to arrange a delivery window before those orders leave the warehouse. Oversized items that ship by truck freight are also covered by free standard shipping on orders of $50 or more.
Enter the model number from your unit's data tag. Add the serial number too and we'll check it against LG's service notices for this part.