Heat Pump error codes
32 documented codes across brands, with ranked causes and repair costs.
Carrier heat pump code chart (6) Goodman heat pump code chart (5) Lennox heat pump code chart (5) Rheem heat pump code chart (6) Trane heat pump code chart (5) York heat pump code chart (5)
Carrier Heat Pump — Ice on outdoor unit Carrier Heat Pump Ice on Outdoor Unit: Causes & Fixes Ice on your Carrier heat pump outdoor unit? Learn normal frost vs. problem ice, the main causes, safe checks, and repair costs from $0 to $2,500+. Carrier Heat Pump — Stuck in defrost mode Carrier Heat Pump Stuck in Defrost Mode: Causes & Fixes Carrier heat pump stuck in defrost? Learn the causes (defrost board, sensor, reversing valve, relay), safe checks, and repair costs from $0 to $1,800+. Goodman Heat Pump — Stuck in defrost mode Goodman Heat Pump Stuck in Defrost Mode: Causes & Fixes Goodman heat pump stuck in defrost? Learn the causes (defrost board, sensor, reversing valve, refrigerant), safe checks, and repair costs. Lennox Heat Pump — Stuck in defrost mode Lennox Heat Pump Stuck in Defrost Mode: Causes & Fixes Lennox heat pump stuck in defrost? Learn the causes (defrost board, sensor, reversing valve, relay), safe checks, and repair costs from $0 to $1,500+. Rheem Heat Pump — Ice on outdoor unit Rheem Heat Pump Ice on Outdoor Unit: Causes & Fixes Ice on a Rheem heat pump outdoor unit: normal frost vs. a real problem, the main causes (airflow, drainage, low charge), safe fixes and repair costs. Rheem Heat Pump — Stuck in defrost mode Rheem Heat Pump Stuck in Defrost Mode: Causes & Fixes Rheem heat pump stuck in defrost? Learn the likely causes (defrost board, coil sensor, reversing valve), safe checks, and repair costs from $0 to $2,500. Trane Heat Pump — Stuck in defrost mode Trane Heat Pump Stuck in Defrost Mode: Causes & Fixes Trane heat pump stuck in defrost? Learn the causes (defrost board, sensor, reversing valve, relay), safe checks, tech diagnosis and repair costs. York Heat Pump — Stuck in defrost mode York Heat Pump Stuck in Defrost Mode: Causes & Fixes York heat pump stuck in defrost? Learn the causes (sensor, board, reversing valve, relay), safe checks, technician fixes, and repair costs. Carrier Heat Pump — Frozen and not defrosting Carrier Heat Pump Frozen and Not Defrosting: Causes & Fixes Carrier heat pump iced over and not defrosting? Learn the causes (airflow, runoff, defrost sensor, board, low charge), safe fixes and repair costs. Goodman Heat Pump — Ice on outdoor unit Goodman Heat Pump Ice on Outdoor Unit: Causes & Fixes Ice on your Goodman heat pump outdoor unit: normal frost vs. a real problem, the likely causes, safe homeowner checks, and typical repair costs. Lennox Heat Pump — Frozen and not defrosting Lennox Heat Pump Frozen and Not Defrosting: Fixes & Cost Lennox heat pump iced over and not defrosting? Learn the causes (water drips, defrost sensor, board, reversing valve), safe checks, and repair costs. Lennox Heat Pump — Ice on outdoor unit Lennox Heat Pump Ice on Outdoor Unit: Causes & Fixes Ice on your Lennox heat pump's outdoor unit? Learn normal frost vs. problem icing, the likely causes, safe checks, and repair costs from $0 to $3,000+. Rheem Heat Pump — Not cooling Rheem Heat Pump Not Cooling: Causes, Fixes & Costs Rheem heat pump not cooling? Learn the likely causes (capacitor, contactor, refrigerant, reversing valve), safe checks and honest US repair costs. Trane Heat Pump — Ice on outdoor unit Trane Heat Pump Ice on Outdoor Unit: Causes & Fixes 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. York Heat Pump — Frozen and not defrosting York Heat Pump Frozen, Not Defrosting: Causes & Fixes York heat pump iced up and not defrosting? Learn the causes (defrost board, sensor, reversing valve, low charge), safe checks, and repair costs. York Heat Pump — Ice on outdoor unit York Heat Pump Ice on Outdoor Unit: Causes & Fixes Why ice builds on a York heat pump outdoor unit: normal frost, roof runoff, airflow, low charge or defrost faults. Safe checks, pro fixes and repair costs. Carrier Heat Pump — Not cooling Carrier Heat Pump Not Cooling: Causes, Fixes & Costs Carrier heat pump not cooling? Learn the causes, from a stuck reversing valve to low refrigerant, which fixes are safe, and what repairs cost. Goodman Heat Pump — Frozen and not defrosting Goodman Heat Pump Frozen and Not Defrosting: Fixes Goodman heat pump iced over and not defrosting? Learn the causes (defrost board, sensor, reversing valve, low charge), safe fixes and repair costs. Lennox Heat Pump — Not cooling Lennox Heat Pump Not Cooling: Causes, Fixes & Costs Lennox heat pump not cooling? Ranked causes like reversing valve, capacitor, low refrigerant and dirty coils, safe checks, and honest repair costs. Rheem Heat Pump — Not heating Rheem Heat Pump Not Heating: Causes, Fixes & Costs Rheem heat pump not heating? Ranked causes from thermostat settings to reversing valves and low refrigerant, safe checks, and repair costs from $0 to $2,500+. Trane Heat Pump — Frozen and not defrosting Trane Heat Pump Frozen, Not Defrosting: Causes & Fixes Trane heat pump iced over and not defrosting? Learn the causes (sensor, defrost board, reversing valve, low charge), safe checks, and repair costs. Trane Heat Pump — Not cooling Trane Heat Pump Not Cooling: Causes, Fixes & Costs Trane heat pump not cooling? Learn the likely causes (capacitor, contactor, refrigerant, reversing valve, frozen coil), safe checks, and repair costs. York Heat Pump — Not cooling York Heat Pump Not Cooling: Causes, Fixes & Costs York heat pump not cooling? Learn the likely causes (filter, thermostat, refrigerant, capacitor, reversing valve), safe checks, and repair costs. Carrier Heat Pump — Auxiliary heat on constantly Carrier Heat Pump Aux Heat On Constantly: Causes & Fixes Carrier heat pump running on aux heat nonstop? Learn the causes, from thermostat setup to defrost and refrigerant faults, plus safe fixes and repair costs.