Armstrong Error Code Search
Error code search offers information on the cause of the malfunction and the status of your air conditioner by entering the error code.
- This page provides a simple explanation concerning content relating to error codes and their possible causes. Please note that the content may slightly differ depending on the model.
2. It is always advised that you consult with an HVAC repair professional before attempting to provide any repairs yourself.
3. Precision Air assumes no responsibility for any accidents or troubles caused in the disassembly or repair of equipment performed according to the information on this page.
If molded case circuit breakers or earth leakage circuit breakers have tripped, do not reset the breaker immediately without first checking for any problems with the insulation of equipment.
Resetting breakers without a check of insulation may cause damage to equipment.
Armstrong Air Conditioning Codes:
RESULT: Device communication problem – No other devices on RS BUS (Communicating systems only).
RESULT: Low line voltage.
RESULT: Line voltage polarity reversed.
RESULT: Ground not detected.
RESULT: High line voltage.
RESULT: Line voltage frequency out of range.
RESULT: Low 24V.
RESULT: High 24V.
RESULT: Poor ground detected (Warning only).
RESULT: Unresponsive device (Communicating systems only).
RESULT: Active communicating thermostat signal missing for more than 3 minutes (Communicating systems only).
RESULT: Control failed self check, internal error, failed hardware. Will restart if error recovers, Integrated control not communicating Covers hardware errors (flame sense circuit faults, pin shorts, etc).
RESULT: Control internal communication problem.
RESULT: Corrupted control parameters (Verify configuration of system) (Communicating systems only).
RESULT: Outdoor air temperature sensor failure. Only shown if shorted or out of range (Communicating systems only).
RESULT: Hard Lock out – Rollout circuit open or previously open.
RESULT: Indoor blower/communication failure. Unable to communicate with blower motor.
RESULT: Indoor blower motor mismatch – indoor motor horsepower does not match unit capacity.
RESULT: Appliance capacity size is NOT programmed. Invalid unit codes. Refer to the configuration flow chart.
RESULT: Gas valve miswired.
RESULT: Gas valve control relay contact shorted.
RESULT: Gas valve second stage relay failure.
RESULT: Hot surface igniter sensed open
RESULT: Low pressure switch failed open.
RESULT: Low pressure switch failed closed. Refer to troubleshooting.
RESULT: High pressure switch failed open. Refer to troubleshooting.
RESULT: High pressure switch failed closed. Refer to troubleshooting.