HVACopediaGoodman · Furnace
Rapid flash Reversed polarity
What the control is telling you
The LED flashes rapidly all the time. 115 V or 24 V polarity is reversed, or the transformer's orange and gray wires are swapped. Furnace will not run.
Applies to: GMES9, GCES9, AMES9, ACES9, VMES9, VCES9 (single stage, 92% and 96%)
Likely causes
- 115 V hot and neutral swapped at the furnace or control
- Orange and gray transformer wires reversed
- Poor unit ground
Test and repair steps
- Turn off power before repairs.
- Check the wiring diagram and correct the 115 V polarity.
- Swap the orange and gray wires at the transformer if they are reversed.
- Check the unit ground and correct it.
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 off No LED - no power or control failure
- LED steady on Normal operation
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Source: Goodman Service and Troubleshooting GMES9*/GCES9*/AMES9*/ACES9*/VMES9*/VCES9* (RS6612016r3) , Troubleshooting Chart p.53; 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.