Home Fault Codes

Goodman Furnace Error Code E4: Meaning and Fix

Applies to: Goodman GM9S80, GC9S80 and VM9S80 single-stage 80% furnaces with the E-code display control (Goodman service manual RS6621008).

E4
How E4 appears on a Goodman furnace display.

Reading the furnace display

A furnace reports faults on a small status LED on the control board, seen through the sight glass in the blower door, or on a two-digit display. Watch a full cycle of the pattern and count the flashes, including the pause between groups, before you decide what you saw. The code chart is on the label inside the blower door.

This page lists the fault codes this brand documents, with likely causes and a short repair path. The codes apply to model numbers such as GM9S80 and GC9S80; check the label on your unit to confirm yours.

What causes E4

How to fix it

If you smell gas, leave the building and call your gas utility from outside; do not touch switches or the furnace. Switch the furnace power off before you open the blower door or touch the igniter or flame sensor, and call a licensed HVAC technician if you are not sure.

The code meaning comes from the manufacturer document listed under Sources. The causes and steps below are general troubleshooting guidance, not the manufacturer's service procedure.

  1. If you smell gas or can see flame when the thermostat is not calling for heat, switch the furnace off, leave the building and call your gas utility from outside.
  2. Do not keep running a furnace that shows flame without a call for heat.
  3. A technician should correct any short at the flame sensor or in its wiring.
  4. The technician should also check for a lingering flame and verify the gas valve operation.
  5. Restore power and run a heating cycle. If the code returns, call a licensed HVAC technician and give them the code, the board label and the furnace model number.

Questions

What does E4 mean on a Goodman furnace?

E4 on a Goodman single-stage furnace means the control senses flame when there is no call for heat. The inducer and circulator blower may run continuously.

Can I reset the furnace myself?

The control can be reset by switching power off at the furnace switch or breaker for about 30 seconds, which clears some lockouts. If the same code returns, the fault is still present and the control will shut the furnace down again. Never bypass a safety switch to keep it running.

Is E4 dangerous?

It can be, because it means flame is detected when the thermostat is not calling for heat. If there is a gas smell, leave the building and call the gas utility. Otherwise switch the furnace off and call a licensed technician.

Other brands with code E4

The same code can mean something different on another maker's appliance. Check the brand before you act.

Amana furnaceFlame sensed with no call for heatGE dishwasherLeak / overfillSpeed Queen dryerDoor switch fault

Other Goodman furnace codes

E0Ignition lockout after repeated failed ignitionE1Pressure switch closed at the start of the heating cycleE2Pressure switch circuit not closedE3Primary limit circuit openE5Open fuse or short in low voltage wiringE6Low flame sense signal

Sources

Part numbers are OEM references; confirm fit by your model number before ordering. Meanings compiled from manufacturer and parts-retailer documentation; see sources below. Unplug the appliance before opening it.

Applies to models including GM9S80, GC9S80, GMEC96.