Trane error codes
40 documented codes with ranked causes, repair costs, and step-by-step guidance.
Trane air conditioner code chart (2) Trane heat pump code chart (15) Trane furnace code chart (23)
Trane Air Conditioner — Outdoor fan not spinning Trane AC Outdoor Fan Not Spinning: Causes, Fixes & Costs Trane AC outdoor fan not spinning? Learn the likely causes (capacitor, motor, contactor), safe homeowner checks, and typical repair costs of $150–$900. Trane Air Conditioner — Not cooling Trane AC Not Cooling: Causes, Fixes & Repair Costs Trane AC not cooling? Learn the likely causes (dirty filter, failed capacitor, low refrigerant, frozen coil), safe fixes, and honest repair costs. Trane Heat Pump — Runs constantly Trane Heat Pump Runs Constantly: Causes, Fixes & Costs Why a Trane heat pump runs nonstop: sizing, low charge, dirty coils, stuck contactor, thermostat issues. Safe checks, tech diagnosis and $0 to $2,500+ costs. Trane Heat Pump — Flashing light Trane Heat Pump Flashing Light: Meaning, Causes & Fixes Trane heat pump flashing light explained: what the outdoor board LED means, common causes like pressure and sensor faults, safe checks, and repair costs. Trane Heat Pump — Won't turn on Trane Heat Pump Won't Turn On: Causes, Fixes & Costs Trane heat pump won't turn on? Learn the likely causes (power, thermostat, float switch, transformer, board), safe checks, and repair costs. Trane Heat Pump — Compressor not running Trane Heat Pump Compressor Not Running: Causes & Fixes Trane heat pump compressor not running? Learn the likely causes (capacitor, contactor, lockout, pressure switch), safe checks, and repair costs. Trane Heat Pump — Loud noise Trane Heat Pump Loud Noise: Causes, Fixes & Costs Trane heat pump making loud noise? Learn normal defrost sounds vs. real faults like fan, compressor or contactor issues, safe checks, and repair costs. Trane Heat Pump — Breaker keeps tripping Trane Heat Pump Breaker Keeps Tripping: Causes & Fixes Why a Trane heat pump keeps tripping its breaker: shorted compressor, failed capacitor, wiring or aux heat faults. Safe checks, fixes and repair costs. Trane Heat Pump — Blowing cold air in heat mode Trane Heat Pump Blowing Cold Air in Heat Mode: Fixes Why a Trane heat pump blows cool air on heat: defrost, reversing valve, low charge, thermostat setup. Safe checks, fixes and $0–$2,500 repair costs. Trane Heat Pump — Short cycling Trane Heat Pump Short Cycling: Causes, Fixes & Costs Why a Trane heat pump short cycles: oversizing, refrigerant, pressure switches, defrost and thermostat causes, safe checks, and repair costs. Trane Heat Pump — Outdoor fan not spinning Trane Heat Pump Outdoor Fan Not Spinning: Causes & Fixes Trane heat pump outdoor fan not spinning? Learn the causes (capacitor, motor, contactor, defrost board), safe checks, and repair costs. Trane Heat Pump — Auxiliary heat on constantly Trane Heat Pump Aux Heat On Constantly: Causes & Fixes Why a Trane heat pump runs auxiliary heat nonstop: thermostat setup, low charge, failed relays, defrost faults. Safe checks and repair costs. 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. 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. 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. Trane Heat Pump — Not heating Trane Heat Pump Not Heating: Causes, Fixes & Costs Trane heat pump not heating? Learn the likely causes (defrost, low refrigerant, reversing valve, capacitor), safe checks, and repair costs. Trane Furnace — Runs constantly but not enough heat Trane Furnace Runs Constantly But Not Enough Heat Trane furnace runs nonstop but can't keep up? Causes from dirty filters to failing heat exchangers, DIY checks, fixes and honest US repair costs. Trane Furnace — Leaking water Trane Furnace Leaking Water: Causes, Fixes & Costs Trane furnace leaking water is usually a clogged condensate drain, bad trap, or cracked inducer. See causes, safe checks, fixes & real US costs. Trane Furnace — Pressure switch stuck open Trane Furnace Pressure Switch Stuck Open: Causes & Fixes Trane furnace pressure switch stuck open: causes from blocked vents to a failing inducer, safe checks, and repair costs from $0 DIY to $1,200. Trane Furnace — Blower not running Trane Furnace Blower Not Running: Causes & Fixes Trane furnace blower not running? Causes from door switches to bad capacitors or blower motors, DIY checks, and honest repair costs. Trane Furnace — Blower won't shut off Trane Furnace Blower Won't Shut Off: Causes & Fixes Trane furnace blower runs constantly? Causes include thermostat fan settings, a stuck limit switch or bad control board, plus fixes and repair costs. Trane Furnace — Clicking but not starting Trane Furnace Clicking But Not Starting: Causes & Fixes Trane furnace clicking but not starting? Causes include a failing ignition relay, weak transformer, or draft inducer. Fixes and costs from $0 DIY to $600. Trane Furnace — Flame sensor problems Trane Furnace Flame Sensor Problems: Causes & Fixes Trane furnace flame sensor problems cause short cycling and lockouts. Causes, safe homeowner checks, how a technician diagnoses it, and real repair costs.