Comprehensive error code reference for furnaces, boilers, heat pumps, and ACs across all major brands
Call Now: 778-909-5731Furnace has attempted ignition 3 times and failed, triggering a safety lockout with no heat.
Furnace pressure switch detects inadequate draft and prevents firing for safe exhaust venting.
Flame sensor not detecting flame after gas valve opens, shutting down the burner.
Mitsubishi heat pump communication lost between indoor and outdoor units.
Navien boiler detected blockage in air supply or exhaust venting and shut down.
Boiler failed to ignite burner after multiple attempts and locked out.
Boiler water temperature exceeded maximum safety limit, triggering emergency shutdown.
Daikin heat pump printed circuit board has detected an internal fault.
Heat pump freeze prevention mode activated, temporarily stopping operation.
Boiler flow sensor not detecting sufficient water flow for safe operation.
Lennox furnace limit switch opened 5 times in one call for heat, locking out system.
Lennox furnace failed to ignite after multiple attempts.
Viessmann boiler detected flame failure during operation and shut down burner.
Viessmann boiler outdoor temperature sensor has failed or reading incorrectly.
Weil-McLain boiler vent blockage detected, system shut down for safety.
Trane heat pump inverter drive module fault detected.
High pressure switch opened due to excessive refrigerant pressure.
Low pressure switch opened due to suction pressure dropping too low.
Furnace control board detected incorrect line voltage.
Boiler water pressure sensor reading outside normal operating range.
Boiler combustion fan not operating at correct speed or has failed.
Heat pump compressor temperature or pressure sensor has failed.
Rollout switch detected flames escaping burner compartment, furnace shut down.
LG heat pump outdoor unit control PCB has detected a fault.
Navien boiler control board communication error between main and display PCBs.
Carrier heat pump outdoor control board EEPROM data corrupted.
Furnace control board detected blower motor circuit fault.
Gas supply pressure too low for proper equipment operation.
Flame sense circuit not generating enough microamp signal.
Boiler flue gas temperature exceeded maximum safe limit.
Samsung heat pump indoor fan motor not operating correctly.
Furnace draft inducer motor not running or not reaching proper speed.
Heat pump refrigerant leak detection sensor has activated.