Trane Heat Pump error codes
5 Trane heat pump codes and problems, each with ranked causes, safe homeowner checks and honest repair costs. Count the flashes or read the code on your control board, then find it below. Legends vary by board revision, so confirm against the label inside your unit's door.
| Code | What it means | Severity |
|---|---|---|
| Frozen and not defrosting | Trane heat pump iced over and not defrosting? Learn the causes (sensor, defrost board, reversing valve, low charge), safe checks, and repair costs. | Call a pro |
| Ice on outdoor unit | Ice on a Trane heat pump outdoor unit: normal frost vs. problem icing, causes like low charge, defrost faults and poor drainage, safe fixes and repair costs. | Call a pro |
| Not cooling | Trane heat pump not cooling? Learn the likely causes (capacitor, contactor, refrigerant, reversing valve, frozen coil), safe checks, and repair costs. | Call a pro |
| Not heating | Trane heat pump not heating? Learn the likely causes (defrost, low refrigerant, reversing valve, capacitor), safe checks, and repair costs. | Call a pro |
| Stuck in defrost mode | Trane heat pump stuck in defrost? Learn the causes (defrost board, sensor, reversing valve, relay), safe checks, tech diagnosis and repair costs. | Call a pro |
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