Armstrong air conditioning units are essential for indoor comfort during hot weather, but service-related errors have occasionally arisen. Users have reported delays in addressing issues such as cooling malfunctions, refrigerant leaks, or compressor problems. Timely resolution is crucial to ensure comfort and well-being, especially during peak cooling seasons. Users have emphasized the importance of service technicians possessing the expertise to diagnose and repair air conditioning issues accurately.
E01: Evaporator Coil Sensor Malfunction
The sensor monitoring the evaporator coil temperature has reported readings outside the expected range.
E02: Condenser Coil Overheating
The condenser coil temperature has exceeded the safe operating limit, indicating potential airflow problems or refrigerant issues.
E03: Low Refrigerant Level
The system has detected a low refrigerant level, which can lead to decreased cooling performance and potential compressor damage.
E04: Compressor Overload
The compressor is working harder than expected, possibly due to a refrigerant issue or blockage in the system.
E05: Airflow Restriction
The system detects reduced airflow, suggesting dirty filters or blockages in the ductwork.
E06: Fan Motor Failure
The fan motor is not running at the expected speed or has failed to start, affecting the unit’s cooling capacity.
E07: Electrical Component Short Circuit
One or more electrical components have a short circuit, risking damage to the system and reducing its efficiency.
E08: Drain Pan Overflow
The drain pan beneath the evaporator coil is full or overflowing, indicating a clogged drain line.
E09: Communication Error with Thermostat
The air conditioner is having trouble communicating with the thermostat, leading to potential cooling discrepancies.
E10: External Unit Non-responsive
The external unit of the air conditioner is not responding, potentially due to power issues or component failures.
E11: Internal Air Filter Dirty
The internal air filter is restricting airflow due to dirt and debris and requires cleaning or replacement.
E12: System Pressure Anomaly
The pressure within the system is either too high or too low, suggesting refrigerant issues or potential leaks.
E13: Defrost Mode Malfunction
For units with a heating function, the defrost mode is not working correctly, leading to ice buildup.
E14: Noise Level Anomaly
The system is producing sounds or vibrations outside of the expected range, suggesting potential mechanical issues.
E15: Power Supply Fluctuation
The unit is experiencing power supply inconsistencies, which can lead to system interruptions or component stress.
E16: Coil Frost Detection
Excessive frost has been detected on the coils, impacting the unit’s efficiency.
E17: Refrigerant Leak Detected
The system sensors have detected a potential refrigerant leak, which can degrade cooling performance and be environmentally harmful.
E18: Control Board Failure
The main control board is not responding or malfunctioning, affecting overall system operation.
E19: Humidity Sensor Fault
The sensor responsible for monitoring room humidity is malfunctioning, affecting dehumidification performance.
E20: UV Lamp Fault
For units equipped with UV lamps for air purification, the lamp is not functioning correctly or needs replacement.
E21: Inverter Circuit Malfunction
The inverter circuit, which controls the compressor’s speed, is malfunctioning, potentially leading to variable cooling inefficiencies.
E22: External Unit Fan Error
The fan in the external unit is not spinning or is spinning at an incorrect speed, impacting heat exchange.
E23: Capacitor Failure
One or more capacitors in the system are failing, which may affect the startup and operation of motors.
E24: Temperature Fluctuation Detected
Unexpected and rapid temperature fluctuations have been detected inside the conditioned space.
E25: Remote Control Signal Error
The system is having difficulty receiving signals from the remote control, leading to potential operation issues.
E26: Anti-freeze Protection Activated
The system has detected potential freezing conditions and has activated its anti-freeze protocols.
E27: High Pressure Safety Trip
Excessively high pressure has been detected in the system, triggering a safety shutdown.
E28: Desaturation Fault
The compressor’s desaturation monitoring has detected an anomaly, potentially indicating compromised refrigerant flow.
E29: Wi-Fi Module Error
For units with smart capabilities, the Wi-Fi module is not functioning correctly, affecting remote management and monitoring.
E30: Expansion Valve Error
The expansion valve, crucial for regulating refrigerant flow, is malfunctioning or is stuck.
E31: External Unit Overtemperature
The external unit’s temperature has risen above the safe limit, potentially due to fan malfunction or debris blockage.
E32: Insufficient Refrigerant Charge
The system has detected an insufficient refrigerant charge, impacting cooling efficiency.
E33: Excessive Vibration Detected
The system’s internal or external components are experiencing excessive vibrations, potentially indicating wear or misalignment.
E34: Ambient Temperature Sensor Fault
The sensor monitoring the outside ambient temperature is malfunctioning, impacting system efficiency adjustments.
E35: Overcurrent Detection
The system has detected an overcurrent situation, possibly due to a malfunctioning component or electrical issue.
E36: Delayed Startup Error
The air conditioner is experiencing delays in starting up after being activated.
E37: Relay Malfunction
One or more relays in the system are not switching as expected, affecting various components’ operation.
E38: Return Air Sensor Error
The sensor monitoring the return air temperature is malfunctioning or reporting readings outside the expected range.
E39: Drain Pump Failure
The pump responsible for removing condensate from the unit is not functioning correctly.
E40: Refrigerant Overcharge
Excessive refrigerant has been detected in the system, which can lead to operational inefficiencies and potential component damage.
E41: Air Flow Calibration Error
The system cannot calibrate the airflow properly, potentially due to sensor issues or fan malfunctions.
E42: Control Panel Communication Error
The main unit is unable to communicate with the control panel, possibly due to wiring issues or control panel malfunctions.
E43: Temperature Set Point Discrepancy
The detected room temperature differs significantly from the set point, indicating potential sensor inaccuracies or system inefficiencies.
E44: System Reset Required
Due to an unspecified error, the system requires a manual reset.
E45: Memory Error
The system’s internal memory, responsible for storing settings and operational data, is malfunctioning.
E46: Heat Exchanger Overheat
The heat exchanger temperature has exceeded the safe operating threshold, indicating potential blockages or refrigerant issues.
E47: Compressor Start-up Delay
The compressor is experiencing delays when trying to start, potentially due to electrical or mechanical issues.
E48: Low Voltage Detection
The system is receiving insufficient electrical voltage, which can lead to performance issues or system shutdowns.
E49: High Voltage Detection
The system is receiving an electrical voltage beyond its operational range, risking damage to components.
E50: Software Update Failure
For smart-enabled units, a software update attempt has failed, requiring manual intervention or tech support.
E51: Internal Overheating
The internal components of the air conditioner are overheating, possibly due to reduced airflow or component failures.
E52: Excessive Compressor Cycles
The compressor is cycling on and off more frequently than expected, suggesting potential system inefficiencies or malfunctions.
E53: Insufficient Cooling
The system is not achieving the desired cooling level, potentially due to low refrigerant, component failures, or calibration issues.
E54: Icing Detected
Ice formation has been detected on the unit, which can reduce efficiency and potentially damage components.
E55: System Longevity Error
The system’s operational hours have reached a critical level, suggesting potential maintenance or replacement needs.
E56: Outdoor Sensor Malfunction
The sensor monitoring the external environment’s conditions is malfunctioning, impacting system performance adjustments.
E57: Refrigerant Circuit Blockage
A blockage in the refrigerant circuit has been detected, potentially reducing cooling performance.
E58: Unspecified Hardware Error
The system has detected a hardware malfunction without a specific code, requiring a diagnostic check.
E59: Configuration Error
The system’s configuration settings are incompatible or corrupted, necessitating a reset or technician intervention.
E60: Internal Circuitry Mismatch
The system’s internal circuitry is not aligned or communicating properly, suggesting potential electrical issues.
