What It Means
Outdoor unit IPM power module thermal or current protection trip.
York All Systems
York Error Code F1
Troubleshooting guide for the York system fault F1.
Possible Causes
- IPM heatsink thermal overload from dust or blocked airflow.
- Short circuit or ground fault in compressor wiring/windings.
- Loose or corroded IPM drive board connection.
- Faulty IPM drive module requiring replacement.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis
F1 is a protection trip for the outdoor unit's IPM (Intelligent Power Module) — the driver component that switches power to the inverter compressor. This is a hardware-level protection distinct from F2, which reports overcurrent measured at the compressor itself, and from F19, which is a supply-voltage fault; F1 specifically guards the power module driving the compressor against conditions like overheating, overcurrent at the module, or a short in the drive circuit. When it trips, the outdoor unit locks out compressor operation, cutting cooling/heating to all indoor units served by that outdoor unit.
All Recorded Causes
Check the IPM's heatsink and cooling path for dust buildup or blocked airflow that would cause it to overheat. Inspect compressor wiring and windings for a short or ground fault that could damage the module. Verify the IPM's connections to the outdoor PCB are secure and free of corrosion. Replace the IPM/drive board if it continues to fault with compressor wiring and cooling confirmed good.
Verify Before Replacing Parts
- Confirm the exact York model family and default context before acting on a generic code description.
- Confirm board LEDs, wiring polarity, and model compatibility before replacing control boards — this York fault points at check the IPM's heatsink and cooling path for dust buildup or blocked airflow that would c….
- Check for intermittent communication faults caused by connectors, moisture, or damaged harnesses, and rule out inspect compressor wiring and windings for a short or ground fault that could damage the m….
- After the correction, run the system long enough to confirm the default fault does not return under normal load.
Not sure which system this York code is on?
ACLogics has guided diagnostics for 60 York fault codes and asks the right questions to narrow it down.
