York aircon LP error code & blinking light
Use this York LP guide to capture the fault correctly and see what should be checked before parts are quoted.
What does York LP mean?
York LP is listed as indoor unit and outdoor unit do not match in Inverter Split, Multi-Split rows such as York P Series 9K-12K 115V wall-mounted ductless. The loaded row is source-backed by official diagnostic material. Confirm the exact model, series, or signal row before accepting a parts quote.
Indoor and outdoor unit capacity, jumper, model, or platform mismatch.
Incorrect setting after installation, PCB change, or mixed-system work.
Communication or board configuration issue if the setting is correct but the fault returns.
What to do now
Use these steps before customer action or a parts quote.
Stop using the unit if LP returns
If LP remains displayed or returns during operation, do not attempt an unsourced reset; get the matching source row diagnosed.
No manufacturer reset steps listed for LP
Capture the complete LP pattern and model stickers first. The selected source row lists no customer reset procedure; do not treat a generic power-cycle as manufacturer guidance.
Send these to us
LP error code and blinking light, a clear display photo and blinking-light video if the unit shows one, York model stickers, affected rooms, operating state when the code appeared, and recent installation, PCB, or model-pairing work
Source-specific guidance
These diagnostic-reference notes help match the code to the exact model. Electrical, refrigerant, wiring, resistance, and component checks are technician work, not DIY steps.
| Source detail | What it says |
|---|---|
| Diagnostic note | Verify indoor/outdoor pairing and installed model numbers before changing boards. |
| Singapore / model note | YorkNow / Johnson Controls P Series technical-guide row. Use for the listed P Series 9K-12K 115V wall-mounted ductless family, not as a Singapore YHFF fault-code table. |
What to check before repair
Use this split to separate safe evidence capture from the tests a technician should prove before quoting parts.
| You can check | Technician should confirm |
|---|---|
| Before taking any system action on LP, take a clear display photo and blinking-light video if the unit shows one. | Confirm the exact model pairing behind LP. |
| Capture the York indoor and outdoor model stickers so the correct family row is used. | Check jumper caps, capacity settings, paired indoor/outdoor model compatibility, and recent board changes. |
| The selected source row lists no customer reset procedure. Note whether one room, several rooms, or the whole system is affected. | Only quote parts after configuration and communication checks are ruled out. |
What changes the next step
These clues decide whether the first check is room-side, shared outdoor-side, refrigerant-side, source-table, or model-family confirmation.
| What you see | What it points to |
|---|---|
| Only one indoor unit shows LP. | The affected room, indoor board path, wiring route, or local component should be checked first. |
| Several rooms or the outdoor unit show the same LP fault. | Prioritise the shared outdoor side, power path, and source-listed system branch. |
| The fault remains displayed or returns during operation. | Start with the source-row diagnostic branch before approving parts. |
| The model family is different from the row you found online. | Use the model or series filter first; same-looking codes can still belong to different diagnostic tables. |
| The model belongs to Inverter Split, Multi-Split rows such as York P Series 9K-12K 115V wall-mounted ductless. | The loaded row is source-backed by official diagnostic material. Use the matching source row before quoting parts. |
Configuration or parts decision
York LP can often be corrected by matching settings, model pairing, or board configuration. Parts should be quoted only after setup is confirmed.
Wrong capacity or pairing settings can mimic a hardware fault.
Recent installation, PCB replacement, or mixed-model work changes the first check.
Once configuration is confirmed, the diagnosis can move to wiring or board inputs.
York LP questions
What does the York LP error mean?
Can I fix a York LP error myself?
Is it safe to keep running the aircon with an LP error?
What causes a York LP error?
Will a York LP error need a repair or a full replacement?
What should I send a technician about a York LP error?
Confirm the fault
Share the error code, model number and symptoms so we can assess the likely cause.
Not the right code?
Browse the full York list or check a few codes in the same fault category.
Ready to get started?
Tell us what’s going on. Symptoms, setup, photos, anything we should know. We’ll assess and come back with the right next step.
Read next
Use these if the quote mentions the parts, checks, or repair path this code points to.