AMANA ERROR CODES
Data Verified: January 2026
Professional diagnostic codes and troubleshooting steps.
Technical Note: AMANA systems are part of a shared manufacturing platform. These codes are identical for GOODMAN.
Critical Severity
EAF
A2L Mitigation Sensor Communication Fault
Troubleshooting Steps
- • The control board has lost contact with the A2L leak sensor.
- • Check the 4-pin communication cable between the Mitigation Board and the sensor.
- • Ensure the sensor is receiving 5V DC power from the main board.
- • The system will lock out heating/cooling for safety until communication is restored.
Source Reference Goodman R-454B Puron Advance Training
Critical Severity
ELK
Refrigerant Leak Detected (A2L)
Troubleshooting Steps
- • A2L SAFETY: Refrigerant concentration has reached the trip point.
- • The indoor blower is energized to its maximum CFM to dilute the gas.
- • Evacuate and ventilate the mechanical room immediately.
- • Check for leaks at the evaporator coil and flare connections.
Source Reference Goodman R-454B Puron Advance Training
High Severity
b0
Mitigation Board Hardware Fault
Troubleshooting Steps
- • Internal failure on the A2L mitigation logic board.
- • Power cycle the furnace/air handler to reset the logic.
- • If the code returns, the mitigation daughter-card must be replaced.
Source Reference Goodman R-454B Puron Advance Training
High Severity
EE
Compressor EEPROM Error
Troubleshooting Steps
- • The outdoor control board cannot read its internal memory.
- • Turn off the outdoor disconnect for 5 minutes and restart.
- • If the error persists, the outdoor PCB (Printed Circuit Board) is defective.
Source Reference Goodman R-454B Training / Legacy Cross-Ref
Normal Severity
0
Standby Mode / No Call for Operation
Troubleshooting Steps
- • System is working normally but is not receiving a signal from the thermostat.
- • Check thermostat settings (Cool/Heat/Auto) and setpoint.
- • Verify 24V 'R' power is reaching the thermostat.
Source Reference Goodman Legacy Cross-Ref
High Severity
L
Limit Switch Open (Low Airflow)
Troubleshooting Steps
- • The system is overheating. Immediately replace the air filter.
- • Check for blocked return air grilles or closed supply registers.
- • Verify the blower motor is moving sufficient air in heat mode.
Source Reference Goodman Legacy Cross-Ref
Normal Severity
0
Standby Mode / No Call for Operation
Troubleshooting Steps
- • System is working normally but is not receiving a signal from the thermostat.
- • Check thermostat settings (Cool/Heat/Auto) and setpoint.
- • Verify 24V 'R' power is reaching the thermostat.
Source Reference Goodman Legacy Cross-Ref
High Severity
L
Limit Switch Open (Low Airflow)
Troubleshooting Steps
- • The system is overheating. Immediately replace the air filter.
- • Check for blocked return air grilles or closed supply registers.
- • Verify the blower motor is moving sufficient air in heat mode.
Source Reference Goodman Legacy Cross-Ref
Normal Severity
dF
Defrost Cycle Active (Heat Pump)
Troubleshooting Steps
- • System is working normally; the outdoor fan has stopped to melt ice off the coil.
- • If the system stays in defrost for more than 15 minutes, check the defrost thermistor.
- • Verify the auxiliary heat is engaging during defrost to maintain indoor comfort.
Source Reference Goodman Legacy Cross-Ref
High Severity
E0
Low Refrigerant Pressure Lockout
Troubleshooting Steps
- • Check for a refrigerant leak in the evaporator or condenser coils.
- • Verify the indoor blower is running (low airflow can cause low pressure trips).
- • Inspect the liquid line filter drier for a temperature drop, indicating a restriction.
Source Reference Goodman Legacy Cross-Ref
High Severity
3-Flashes
Open Pressure Switch (Inducer On)
Troubleshooting Steps
- • The draft inducer is running, but the pressure switch won't close. Check for a blocked vent.
- • Inspect the small rubber tubing for cracks or water buildup (condensate).
- • Verify the inducer motor is reaching full speed and the wheel is not damaged.
Source Reference Goodman/Amana LED Flash Codes
High Severity
4-Flashes
High Limit Switch Open (Overheat)
Troubleshooting Steps
- • System is overheating. Immediately replace a dirty or restrictive air filter.
- • Check for blocked return air registers or closed supply vents.
- • Verify the blower motor is running and moving air in heat mode.
Source Reference Goodman/Amana LED Flash Codes