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Goodman gas furnace code EAr: A2L relay fault on the control board
Gas furnace, Canada and United States
The A2L relay in the furnace control board has detected a fault and the furnace is in mitigation mode. It stops heating and only the blower runs.
This needs an HVAC technician. There are a few safe checks you can do first, marked below. Anything inside the unit is a job for a professional.
This involves the refrigerant circuit, which only a licensed technician may open.
Only some models show this code. Check the list below.
What causes it
-
A fault with the A2L relay. A technician checks it, cycles the power, and replaces the control board if needed.
Leave the furnace running while it clears a possible R-32 leakYou can do this
- Leave the furnace powered. In this mode it has stopped the gas heat on purpose and runs its blower at full airflow to dilute any leaked refrigerant. It also switches on a ventilation fan or alarm if one is connected.
- Once the sensor stops detecting refrigerant, the blower keeps running for five more minutes and then the furnace goes back to normal by itself, if there is no other fault.
- Book a licensed HVAC technician to look for a leak at the indoor coil and to check the R-32 sensor and its wiring.
How to read this code on your unit
The code shows on the three-character display on the furnace control board, which you can see through the sight glass on the blower compartment. IdL means the furnace is idle and normal. A blank display means the board has no power or has failed.
Booking an HVAC technician
Book a licensed air conditioning technicianHVAC technician
- Do not open any panels. Refrigerant circuits must only be opened by a licensed technician.
- Note the code, which unit shows it (indoor or outdoor), and the model numbers of both units.
- Book a licensed air conditioning technician and give them those details.
Models that show this code
89 models in 5 ranges
| Range | Models |
|---|---|
| GR9S80 / GD9S80 / AR9S80 | GR9S800403AN, GR9S800403AX, GR9S800603AN, GR9S800603AX, GR9S800603BN, GR9S800603BX, GR9S800604BN, GR9S800604BX, GR9S800803BN, GR9S800803BX, GR9S800804BN, GR9S800804BX, GR9S800804CN, GR9S800804CX, GR9S800805CN, GR9S800805CX, GR9S801005CN, GR9S801005CX, GR9S801205DN, GD9S800403AN, GD9S800403AX, GD9S800603AN, GD9S800603AX, GD9S800804BN, GD9S800804BX, GD9S800805CX, GD9S801005CN, GD9S801005CX |
| GR9S92 / AR9S92 | GR9S920403AN, GR9S920603BN, GR9S920803BN, GR9S920804CN, GR9S920805CN, GR9S921004CN, GR9S921005CN, GR9S921205DN |
| GR9S96 / GD9S96 / AR9S96 | GR9S960403AN, GR9S960603BN, GR9S960803BN, GR9S960804CN, GR9S960805CN, GR9S961005CN, GR9S961205DN, GD9S960403BN, GD9S960603BN, GD9S960804CN, GD9S961005CN, GD9S961205DN, AR9S960403AN, AR9S960603BN, AR9S960803BN, AR9S960804CN, AR9S960805CN, AR9S961005CN, AR9S961205DN |
| GR9T80 / GD9T80 | GR9T800403AN, GR9T800403AX, GR9T800603AN, GR9T800603AX, GR9T800603BN, GR9T800603BX, GR9T800803BN, GR9T800803BX, GR9T800804BN, GR9T800804BX, GR9T800804CN, GR9T800804CX, GR9T800805CN, GR9T800805CX, GR9T800805DX, GR9T801004CN, GR9T801005CN, GR9T801005CX, GR9T801205DN, GD9T800403AX, GD9T800603AX, GD9T800603BX, GD9T800804BX, GD9T800805CX, GD9T801005CX |
| GR9T96 / GD9T96 | GR9T960303AN, GR9T960403AN, GR9T960603AN, GR9T960603BN, GR9T960803BN, GR9T960804CN, GR9T961004CN, GR9T961005CN, GR9T961205DN |
Where this comes from
- GR9S92/GR9S96/GD9S96 gas furnace installation instructions (IOG-2037C) , page 45
- GR9T96/GD9T96 two-stage gas furnace installation instructions (IOG-2038E) , page 52
Checked against the manufacturer's manual on 13 October 2026.
Other Goodman gas furnace codes
| Code | Meaning | What you can do |
|---|---|---|
| EA | Reversed polarity or poor ground | Call a pro |
| EA0 | R-32 refrigerant leak detected | Safe checks first, then a pro |
| EA1 | R-32 refrigerant sensor fault | Safe checks first, then a pro |
| EA2 | A2L relay fault on the control board | Safe checks first, then a pro |
| EAF | Lost communication with the R-32 refrigerant sensor | Safe checks first, then a pro |
| EAL | R-32 refrigerant leak detected | Safe checks first, then a pro |
| EAS | R-32 refrigerant sensor fault | Safe checks first, then a pro |
| Eb0 | Circulator blower motor not running | Call a pro |
| Eb1 | Lost communication with the circulator blower motor | Call a pro |
| Eb2 | Blower motor size does not match the shared data | Call a pro |
| Eb3 | Blower motor limiting its power, temperature or speed | You can often fix it |
| Eb4 | Blower motor tripped (lost rotor control or high current) | Safe checks first, then a pro |
See all refrigerant fault codes on gas furnaces across brands.