HVACopediaGoodman · Furnace
LED off No LED - no power or control failure
What the control is telling you
The diagnostic LED on the control is dark and the furnace does nothing. The wiring diagram legend also lists LED off as a control failure. The LED table adds that off can mean the gas valve was on when it should be off, or off when it should be on.
Applies to: GMES9, GCES9, AMES9, ACES9, VMES9, VCES9 (single stage, 92% and 96%)
Likely causes
- No 115 V to the furnace: disconnect off, door switch open, breaker tripped or fuse blown
- No 24 V at the control, loose 24 V wires
- Blown 3 A control fuse
- Control has an internal fault
Test and repair steps
- Turn off power before repairs.
- Check 115 V and 24 V to the control. Check for a short in the 115 V and 24 V wiring and repair it.
- Check the 3 A control fuse and replace it with a 3 A automotive type if blown.
- Replace the control only after the checks above pass.
Settings for these units
- Normal status displays (7-segment) · Goodman/Amana GM9S96/AM9S96
- Normal status displays (7-segment) · Goodman/Amana GM9S80/AM9S80
- Normal status displays (7-segment) · Goodman/Amana GM9C96/AM9C96
- Minimum recommended filter size · Goodman/Amana GM9C96/AM9C96
Models that show this code
57 models in Goodman/Amana *MES9 single-stage
Other codes on the same units
- 7 flashes Low flame signal
- 8 flashes Igniter relay fault
- 9 flashes Twinning fault
- 10 flashes Open fuse - no 24 V at the control
- 11 flashes Igniter open
- 12 flashes Inducer relay fault
- LED steady on Normal operation
- Rapid flash Reversed polarity
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Source: Goodman Service and Troubleshooting GMES9*/GCES9*/AMES9*/ACES9*/VMES9*/VCES9* (RS6612016r3) , Troubleshooting Chart p.51; LED table p.44. Summarized in our own words; check the original manual for your model.
Homeowner looking at this code? See what it means for you and when to call a technician.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.