HVACopediaGoodman · Furnace
EA 115 V polarity reversed
What the control is telling you
Hot and neutral are swapped at the furnace or the control. Furnace will not run. ComfortNet thermostat shows REVERSED PLTY EA.
Applies to: GMVC95/AMVC95 upflow and *CVC9 counterflow two-stage furnaces
Likely causes
- Line voltage hot and neutral swapped
- Poor unit ground
Test and repair steps
- Safety line voltage. Turn power off at the breaker before rewiring.
- Check the supply wiring against the wiring diagram and swap hot and neutral if needed.
- Check the ground. Resistance from neutral to a burner should be 10 ohms or less.
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
10 models in Goodman/Amana *MVC95/*CVC9 two-stage ComfortNet
Other codes on the same units
- E9 High-stage pressure switch will not close
- L0 Low-stage heat
- CFM readout Airflow number (CFM / 100)
- F Continuous fan
- HI High-stage heat
- OP Normal - waiting for a call
- Red LED 1 flash Red communications LED 1 flash - communication failure
- Red LED 2 flashes Red communications LED 2 flashes - reset in progress
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Source: Goodman *CVC9/95 & *MVC95 Installation Instructions IO-341D (08/2010), Troubleshooting Chart p.53-57; Electrical Connections p.28. 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.