Carrier error codes
47 documented codes with ranked causes, repair costs, and step-by-step guidance.
Carrier air conditioner code chart (2) Carrier heat pump code chart (15) Carrier furnace code chart (30)
Carrier Air Conditioner — Frozen evaporator coil Carrier AC Frozen Evaporator Coil: Causes, Fixes & Costs Carrier AC evaporator coil frozen? Learn the common causes (airflow, low refrigerant, blower faults), safe homeowner fixes and typical repair costs. Carrier Heat Pump — Flashing light Carrier Heat Pump Flashing Light: Causes, Fixes & Costs Carrier heat pump flashing light explained: what the flash codes mean, likely causes like pressure or sensor faults, safe fixes, and repair costs. Carrier Heat Pump — Runs constantly Carrier Heat Pump Runs Constantly: Causes, Fixes & Costs Carrier heat pump running nonstop? Learn the causes, from dirty filters to low refrigerant and stuck contactors, plus safe fixes and repair costs. Carrier Heat Pump — Won't turn on Carrier Heat Pump Won't Turn On: Causes, Fixes & Costs Carrier heat pump won't turn on? Learn the likely causes (power, thermostat, float switch, control board), safe checks, and repair costs from $0 to $1,000+. Carrier Heat Pump — Loud noise Carrier Heat Pump Loud Noise: Causes, Fixes & Costs Carrier heat pump making loud noise? Learn the causes (defrost, fan, compressor, contactor), the safe checks you can do, and repair costs from $0 to $2,800+. Carrier Heat Pump — Breaker keeps tripping Carrier Heat Pump Breaker Keeps Tripping: Causes & Fixes Why a Carrier heat pump keeps tripping its breaker: shorted compressor, failed capacitor, wiring or aux heat faults. Safe checks, fixes, and repair costs. Carrier Heat Pump — Compressor not running Carrier Heat Pump Compressor Not Running: Causes & Fixes Carrier heat pump compressor not running? Learn the likely causes (capacitor, contactor, lockout, pressure switch), safe checks, and repair costs. Carrier Heat Pump — Short cycling Carrier Heat Pump Short Cycling: Causes, Fixes & Costs Why a Carrier heat pump short cycles: thermostat, airflow, refrigerant charge and pressure-switch causes, safe checks, and honest repair costs. Carrier Heat Pump — Outdoor fan not spinning Carrier Heat Pump Outdoor Fan Not Spinning: Causes & Fixes Carrier heat pump outdoor fan not spinning? Learn the likely causes (capacitor, motor, contactor, defrost board), safe checks, and repair costs. Carrier Heat Pump — Blowing cold air in heat mode Carrier Heat Pump Blowing Cold Air in Heat Mode: Fixes Carrier heat pump blowing cold air on heat? Learn the causes, from defrost and thermostat setup to reversing valve faults, plus fixes and repair costs. 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+. 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. 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. 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. Carrier Heat Pump — Not heating Carrier Heat Pump Not Heating: Causes, Fixes & Costs Carrier heat pump not heating? Learn the likely causes (thermostat, defrost, reversing valve, refrigerant, compressor), safe fixes, and US repair costs. Carrier Furnace — Pressure switch stuck open Carrier Furnace Pressure Switch Stuck Open: Causes & Fixes Carrier furnace pressure switch stuck open: blocked vent, weak inducer or condensate clog causes plus fixes and repair costs ($0 DIY–$1,200). Carrier Furnace — Runs constantly but not enough heat Carrier Furnace Runs Constantly But Not Enough Heat Carrier furnace runs nonstop but the house stays cold. Causes from dirty filters to failing heat exchangers, plus DIY checks, fixes and repair costs. Carrier Furnace — Won't ignite Carrier Furnace Won't Ignite: Causes, Fixes & Costs Carrier furnace won't ignite? Common causes include a dirty flame sensor, bad igniter, gas or pressure switch faults, plus DIY checks and repair costs. Carrier Furnace — Won't turn on Carrier Furnace Won't Turn On: Causes, Fixes & Costs Carrier furnace won't turn on? Common causes include a tripped breaker, dead thermostat batteries, blown fuse or bad door switch. Fixes and costs inside. Carrier Furnace — Blower not running Carrier Furnace Blower Not Running: Causes & Fixes Carrier furnace blower not running? Causes from bad capacitors to door switches, plus fixes and repair costs from $0 DIY to $1,200. Carrier Furnace — Blower won't shut off Carrier Furnace Blower Won't Shut Off: Causes & Fixes Carrier furnace blower running non-stop? Causes include fan setting, bad limit switch, or a stuck fan relay, plus DIY checks and repair costs. Carrier Furnace — Clicking but not starting Carrier Furnace Clicking But Not Starting: Causes & Fixes Carrier furnace clicking but not starting? Causes include a cracked igniter, dirty flame sensor, or weak inducer draft. Fixes and costs from $0 to $1,200. Carrier Furnace — Blowing cold air Carrier Furnace Blowing Cold Air: Causes & Fixes Carrier furnace blowing cold air? Common causes are thermostat fan settings, ignition faults, overheating and flame-sensor issues, plus fixes and costs.