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Goodman gas furnace code E15: External return air sensor circuit open
Gas furnace, Canada and United States
The circuit of the external return air temperature sensor is open, so its reading is missing from the CoolCloud app.
This needs a licensed gas technician. There is nothing safe to check yourself. Leave the covers on and book a professional.
Only some models show this code. Check the list below.
What causes it
-
The sensor probe is not fully plugged in or its connector is badly crimped.
-
The sensor probe is faulty; a technician checks its resistance (10 kilohms at 77°F).
-
The control board is faulty.
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 a licensed gas technician
Book a licensed gas technicianlicensed gas technician
- Turn the unit off and leave the covers on. Gas components must only be serviced by a licensed technician.
- Note the code, how often it appears, and the model and serial numbers from the rating label.
- Book a licensed gas technician and give them those details.
Models that show this code
88 models in 6 ranges
| Range | Models |
|---|---|
| GMVC80 / GCVC80 / AMVC80 / ACVC80 | GMVC800603BN, GMVC800603BX, GMVC800604BN, GMVC800604BX, GMVC800803BN, GMVC800804CN, GMVC800804CX, GMVC800805CN, GMVC800805CX, GMVC800805DN, GMVC800805DX, GMVC801005CN, GMVC801005CX, AMVC800603BN, AMVC800603BX, AMVC800604BN, AMVC800604BX, AMVC800803BN, AMVC800804CN, AMVC800804CX, AMVC800805CN, AMVC800805CX, AMVC800805DN, AMVC801005CN, AMVC801005CX |
| GMVC96 / GCVC96 / AMVC96 / ACVC96 | GMVC960403BN, GMVC960603BN, GMVC960803BN, GMVC960804CN, GMVC961005CN, GMVC961005DN, GMVC961205DN, GCVC960403BN, GCVC960603BN, GCVC960804CN, GCVC961005CN, GCVC961205DN, AMVC960403BN, AMVC960603BN, AMVC960803BN, AMVC960804CN, AMVC961005CN, AMVC961005DN, AMVC961205DN, ACVC960403BN, ACVC960603BN, ACVC960804CN, ACVC961005CN, ACVC961205DN |
| GMVM97 / GCVM97 / AMVM97 / ACVM97 | GMVM970603BN, GMVM970803BN, GMVM970804CN, GMVM971005CN, GMVM971205DN, AMVM970603BN, AMVM970803BN, AMVM970804CN, AMVM971005CN, AMVM971205DN |
| GRVM97 / GDVM97 | GRVM970603BN, GRVM970803BN, GRVM970804CN, GRVM971005CN, GRVM971205DN |
| GRVT80 / GDVT80 | GRVT800603BN, GRVT800603BX, GRVT800604BN, GRVT800604BX, GRVT800803BN, GRVT800804CN, GRVT800804CX, GRVT800805CN, GRVT800805CX, GRVT800805DN, GRVT800805DX, GRVT801005CN, GRVT801005CX, GDVT800603BX, GDVT800803BX, GDVT800805CX, GDVT801005CX |
| GRVT96 / GDVT96 | GRVT960403BN, GRVT960603BN, GRVT960803BN, GRVT960804CN, GRVT961005CN, GRVT961005DN, GRVT961205DN |
Where this comes from
- GMVC96/GCVC96 (revisions BA to BC) gas furnace installation instructions (IOG-2015L) , page 46
- GRVT80/GDVT80 gas furnace installation instructions (IOG-2043B) , page 36
Checked against the manufacturer's manual on 13 October 2026.
Other Goodman gas furnace codes
| Code | Meaning | What you can do |
|---|---|---|
| E1A | Onboard return air sensor shorted | Call a pro |
| E6 | Weak flame signal | Call a pro |
| E7 | Igniter circuit problem or poor ground | Call a pro |
| E8 | High-stage pressure switch closed at start of heating | Call a pro |
| E9 | High-stage pressure switch not closing | Safe checks first, then a pro |
| E10 | Grounding fault or poor neutral connection | Call a pro |
| E11 | Rollout switch open | Call a pro |
| E16 | External return air sensor circuit shorted | Call a pro |
| E17 | Supply air sensor circuit open | Call a pro |
| E18 | Supply air sensor circuit shorted | Call a pro |
| E19 | Onboard return air sensor unplugged | Call a pro |
| EA | Reversed polarity or poor ground | Call a pro |
See all temperature sensor fault codes on gas furnaces across brands.