Hi - I have a Goodman GPM furnace. It works intermittently. I replaced breaker, thermostat, Control board and surface igniter. All appears well on start up sequence ; blower runs and igniter heats up and then turns off as no gas comes out. Control board codes says OK. Can anybody recommend what to do next. The house and unit is 6 years old and I have had no problems until now. Thanks

After the igniter heats up, check to see if you get 24 volts to the gas valve itself. If it gets power and doesn't open, it is bad. If it isn't getting power, check the connections to the control board.

Just fixed this problem on my goodman furnace. It was the heat sensor. My furnace kept cycling on and off but would not let the flame burn. The sensor was full of carbon or soot. My ignitor would also light and then shut down. I removed the sensor and lightly sanded it with a 150 grit sand paper till it was shiney again. Works great now and it only took about 15min to do. Just one screw to hold it down and then just unplug it and take it out. Make sure you cut the power to the furnace first. Good luck hope this helps
:)

This was the exact problem that I had. My furnace would fire and then quit within 5 seconds. I cleaned the heat sensor and bang, it works again. Thanks for saving me a $200 service call.

Thanks SIZL37 Did what you said every things great.

Thanks to hvac1000 as well, the pictures were perfect and everything is a-ok.

No problem

Having the same problem here is the heat sensor

Furnace starts up the ignighter glows, flame comes on, blower starts and one minute later the flame goes out. However, the blower remains on.

I flip the thermostat switch to on the thermostat blinks heat 3 times and clicks once furnace doesn't kick on the blower doesn't blow and no heat

Thank You so much for that handy piece of advise. Already spent $230.00 on a repairmen who didn't help me at all (well if you call lightening my wallet some help). Took others advice-no help. Your trick worked wonders. Running strong

My furnace clicks,ignites,flames,blower comes on heats up home all normal right? But,then it turns off and the blower continues to run continuously and furnace does not reheat until I turn it off from circuit breaker for at least an hour then, the furnace will ignite again.Is this a board problem?

My goodman furnes won't start

I have the same problem. The furnace starts up and runs good for a few hours and then you hear it start up,the blower starts, then it flames and then shuts off and it repeats itself until I turn off thermostat and wait a few hours then runs fine for a few more hours. I have a goodman GMs8,GHS8 or GDS8 no idea which one. If anyone could help... Almost sounds like everyone's issue here

I have a goodman 100-3 its like 15 yr old just replced the board and worked fine for 1 day and now I don't get 24vt to the gas valve the only way it runs is if I hook a wire from the transformer what do I do

I have a Goodman GMT0450-3b it was installed in 2003. Since I've had three Ctrl. Bds. Installed, each thime the tech say's everything is grounded well. This time when the furnace wouldn't come on I just assumed it was the ctrl. Bd. And replaced it myself, to try and save another $400.00. The furnace is doing the same thing as it did before the bd. Was replaced. The vent inducer comes on the igniter lights but no gas flow. The status light is constantly lit.

Same problem here, tried cleaning the heat sensor but it didn't help at all. Startup sequence is good, as far as I can tell,but the valve opens intermittently. Any ideas? From what I understand the valve should get ~24V once the ignitor lights, I'm getting ~3-4V on startup, peaking at ~26V once the ignitor lights. Thanks in advance.

My furnace does not light up but we hear a clicking sound and the light indicaticator flashes three times anyone could help...

Where is the control board so I can see which lights are flashing, my goodman furnace is 20 yrs. Old we just replaced the thermostat because sometimes it comes on sometimes it doesn't!@! Help it still isn't working right.

Ignighter seems not to glow long enough gas comes on but no flame, so I cleaned flame sensor and replaced it also, however glow bar won't always glow long enough to start unit. How long should glow bar glow? GMS80703