Goodman Error Code EA: 115 V polarity reversed (Furnace)

Updated October 16, 2026 · by Aurora Star Tech Inc.

Goodman error code EA on a furnace means: 115 V polarity reversed. It is also called Goodman diagnostic code EA.

High severityFurnaceGoodman/Amana *MVC95/*CVC9 two-stage ComfortNet

Homeowner? What Goodman code EA means for you

Call a technician Your furnace is reporting: 115 V polarity reversed. The furnace has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.

Safe things you can check yourself

Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
Make sure the furnace front door or panel is closed properly; many furnaces will not run with the door switch open.
Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
Check that the gas valve next to the furnace is open (handle in line with the pipe). Do not force it.
Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.

Call (647) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Goodman error code EA mean?

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

Common causes of Goodman code EA

Line voltage hot and neutral swapped
Poor unit ground

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Goodman models that use code EA

GCVC90704CX GCVC90905DX GCVC91155DX GCVC950714CX GCVC950915DX GMVC950453BX GMVC950704CX GMVC950905CX GMVC950905DX GMVC951155DX

Other Goodman Furnace codes

Code	Meaning
E6	Low flame signal
E7	Igniter circuit fault
E8	High-stage pressure switch closed at start of heat
E9	High-stage pressure switch will not close
E10	Grounding fault / poor neutral connection
E11	Flame rollout switch open
EE0	Lockout - too many ignition retries (3)
EE1	Pressure switch closed at start of heating cycle
EE2	Pressure switch did not close (inducer runs, no ignition)
EE3	High (primary) limit open
EE4	Flame sensed with no call for heat
EE5	Open fuse (short in low voltage wiring)

All Goodman Furnace error codes →

Goodman code EA: homeowner questions

What does Goodman code EA mean?

115 V polarity reversed. Hot and neutral are swapped at the furnace or the control. Furnace will not run. ComfortNet thermostat shows REVERSED PLTY EA.

Is it safe to keep using my furnace with code EA?

It depends on the cause. The furnace has locked out or cannot run properly. One reset is fine; if the code comes back, it needs a licensed technician to find the cause.

Can I reset Goodman code EA myself?

You can try one reset (power off for 30 seconds, then on). If Goodman code EA comes back, the cause is still there and a licensed technician should check it.

Who can fix Goodman code EA near me?

Aurora Star Tech Inc. repairs Goodman furnaces in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Homeowner help: Furnace Not Turning On: What to Check · Furnace Blinking Light: What the Flash Codes Mean

Troubleshooting guides

Blower cycles on and off All brands · Furnace
Blower runs, not enough heat All brands · Furnace
Blowing cold air All brands · Furnace
Board shows "flame sensed with no call for heat" All brands · Furnace
Can't pull oil (distance/lift) All brands · Furnace
CO in flue / poor combustion numbers All brands · Furnace
Cold air blast at start / blower never stops All brands · Furnace
Combustion gas / odour in house, flu-like symptoms All brands · Furnace
Cycles on limit (not lockout) All brands · Furnace
Does not start All brands · Furnace
Flame burns a few seconds then out All brands · Furnace
Flame conditions table All brands · Furnace
Heat exchanger leak All brands · Furnace
High blower-door ACH50 (>3) All brands · Furnace
High fuel consumption All brands · Furnace
High stack temperature All brands · Furnace
High stack temperature / low efficiency All brands · Furnace
Indoor blower runs, outdoor unit dead All brands · Furnace
Limit opens All brands · Furnace
Locks out — oil but no ignition All brands · Furnace
Low CO2 (<8 %) All brands · Furnace
Low draft / blowback All brands · Furnace
Modulating furnace won't modulate All brands · Furnace
Negative house pressure, backdrafting, infiltration All brands · Furnace
No heat All brands · Furnace
No heat All brands · Furnace
No heat (ignition stage) All brands · Furnace
Noisy All brands · Furnace
Noisy registers, drafts, blower overamps/ECM noise, coil freezing All brands · Furnace
Not running / fault code All brands · Furnace
Oil + ignition OK but no flame All brands · Furnace
Oil on floor All brands · Furnace
Pressure switch open / stuck All brands · Furnace
Puff-back / delayed ignition All brands · Furnace
Reduced airflow, hot motor All brands · Furnace
Reduced pressure, smoky shutdowns, lockouts All brands · Furnace
Rollout switch tripped All brands · Furnace
Short cycling All brands · Furnace
Smoke, soot, odour, pulsation All brands · Furnace
Starts but locks out — no oil at nozzle All brands · Furnace
Too little / too much air All brands · Furnace
Unsatisfactory heat (short cycles / uneven / not enough) All brands · Furnace
Water flows with furnace off All brands · Furnace
Clear an E0 lockout (3 ways) Goodman · Furnace
ComfortNet data line check - Goodman *MVC95/*CVC9 Goodman · Furnace
Control display blank, furnace dead - Goodman/Amana 9-speed ECM furnaces Goodman · Furnace
Display blank, furnace dead - Goodman *MVC95/*CVC9 Goodman · Furnace
No heat - Goodman/Amana 9-speed ECM furnaces Goodman · Furnace
Open the furnace advanced menus from a ComfortNet thermostat Goodman · Furnace
Poor combustion / flame problems - Goodman/Amana GM9C96 Goodman · Furnace
Reload model data with the memory card Goodman · Furnace
Reset the ComfortNet network (learn button) Goodman · Furnace
Reset the furnace control to factory defaults (rFd) Goodman · Furnace
Temperature rise out of range - Goodman *MVC95/*CVC9 Goodman · Furnace
Turn on dehumidification Goodman · Furnace
Use a single-stage thermostat (timed staging) Goodman · Furnace
View and clear the last 6 furnace faults Goodman · Furnace
View and clear the last 6 stored faults (L6F) Goodman · Furnace

Source: Goodman *CVC9/95 & *MVC95 Installation Instructions IO-341D (08/2010), Troubleshooting Chart p.53-57; Electrical Connections p.28. Written in our own words as a summary; always check the original manual.

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.