Goodman Furnace Solid Red Light On But Furnace Not Working [Solved]

A solid red light on a Goodman furnace indicates normal operation. If the LED flashes it’s an indication of an error. When there is a problem or an error, the red light will flash a sequence then repeat to indicate this.

However, sometimes, you would have a solid red light but your furnace isn’t working. This can be due to a few things. Let’s look at the common causes for this problem.

Reasons for Goodman Furnace solid red light but furnace not working

Possible Cause	Fix
Thermostat wiring issue	Check thermostat wiring
Defective thermostat	Replace thermostat

Thermostat wiring issue

If you have a solid red light on your Goodman furnace but the furnace is not working or not kicking on with the thermostat, you could have a thermostat wiring issue.

If you can, start by going down to the furnace and open the compartment panel, jumper the R and W wire and wait for at least 5 minutes.

Be sure to tip the compartment door switch of the furnace won’t be powered. If the furnace kicks on, chances are you have a thermostat wiring issue or your thermostat is bad.

You can also try to jumper the R and W wire at the furnace. If the furnace kicks on then you definitely have a problem with your thermostat in which case you might need a replacement.

Defective thermostat.

Another possible reason why your furnace is not working but has a solid red light on, could be that you have a defective thermostat. A thermostat is responsible for regulating the temperature in the heating system.

It sends signals to the circuit control board which relays the instruction to every part of the Furnace system.

If defective a thermostat wont send signals to the control board. A long term solution to this problem is to replace a thermostat with a new one.

Goodman Furnace Red Light Flashing (Furnace Error Codes)

Having looked at the possible reasons your furnace would not work when your control board is working just fine, there are times when the red light would flash a number of times to indicate an error code.

The following chart shows the different meanings of the flashing light on a Goodman furnace and the solutions to each of the problems.

NUMBER OF FLASHES	PROBLEM	SOLUTION
Steady on	Normal operation
OFF	Replace Control Board.	Replace Control Board.
1 Flash	System lockout (Retries exceeded)	After one hour of lockout, your furnace will automatically reset itself.
2 flashes	Pressure switch stuck closed	You should either repair the short or replace the pressure switch.
3 flashes	Pressure switch stuck open	You should check the pressure switch hose for blocks or an improper connection. Otherwise, see if any loose wiring needs tightening.
4 flashes	Open high limit	You should check and clean all the filters, tighten the wiring, and see if there are any blockages in the flue.
5 flashes	Flame sense without gas valve	You should check for a leaky or open gas valve or a lingering burner flame.
6 flashes	Open rollout or open fuse	Replace Fuse.
7 flashes	Low flame signal	Adjust the gas pressure according to the information available to you.
8 flashes	This means your furnace has an igniter circuit problem due to a defective igniter or an improperly connected igniter	Check your Goodman furnace for a pinched or blocked pressure switch hose.
9 flashes	This means that your furnace has a high-stage pressure switch that won’t close during a high-stage-induced draft blower operation.	Replace the igniter or check the ground wiring for defects.
Continuous/ Rapid flashes	Reversed 115 vac polarity	You will have to correct the wiring polarity after reviewing the wiring diagram.

How to Reset Goodman Furnace

Follow these steps to properly reset your Goodman furnace:

Step 1:

Locate the circuit breaker switch associated with the Goodman furnace and flip it to the “OFF” position. This will disconnect the unit from its electrical power supply.

Step 2:

Gently remove the access panel of the furnace to access its internal components. Hold onto the panel’s sides and lift it to release the retaining tab from the furnace’s base. Depending on the model, you might need to remove a side panel screw.

Step 3:

Identify the rollout switch positioned on the burner assembly. This switch will be colored red and situated at the center of the assembly.

Step 4:

Press and hold down the reset button, which is integrated into the rollout switch components. Maintain the button’s pressure for approximately one to two seconds before releasing it.

Final Thoughts

In summary, I hope you have finally figured out why your furnace is not working despite the solid red light on.

If the red light is flashing, just look at the pattern or sequence of the flashing light and refer to the chart we have provided in this guide.

Otherwise, if you are unable to figure out what the problem is with your furnace, I strongly recommend you call in a local HVAC professional for help.

Thanks for reading.

More resources: https://www.youtube.com/watch?v=Qj87QDRzkyQ