This is a repost. I originally listed as an oil furnace but it is a propane gas furnace. Figured wrong listing was not getting any looks from those knowledgeable with gas furnaces.

I have a Comfortmaker Model GUH125H020IN furnace that will ignite (90% of the time) when first energized and then the draft motor will run (non-stop) but no ignition after that. If you turn off the power or reset the thermostat it will ignite just as stated above. I have replaced the ignitor and the probe but to no avail. I do notice on the control module, that when ignition does not occur, the lower right red LED is blinking continuously. I live in WV and it is now COLD in the house. Any help or suggestions as to what I should replace and where to obtain replacement parts would be greatly appreciated. A neighbor suggested the control module.
Thanks

 

When you don't get ignition, does anything at all happen other than the exhaust blower running? A make & model of the control would be a help.

 

Nothing else happens other than the exhaust blower running and the lower right LED blinking. The module is PN 50E47843SI. I had the PN written down but didn't write down the make. I'll look it up when I get home tonight. Hope this helps.
Thanks
John

 

Here is the latest info on my furnace. Hope someone can help.
Comfortmaker Model # GUH125A020IN

Serial # R913400071

Module

White Roberts Div.

Emerson Electric Co.



When unit first calls for heat the blower motor starts and then the ignitor glows. The gas valve then releases gas and burners ignite. When temperature gets to point that main blower starts blowing air the burners go out. As the blower continues and the temperature reduces the unit energizes the ignitor. The gas valve then allows gas and the burners ignite. As soon as the ignitor stops glowing the burners turn off. This cycle is repeated constantly without ever getting full burn time again.

I also just replaced the flame sensor in case that was the problem. Apparently not.

 

I think you would be well advised to get a pro in there to inspect the heat exchanger. I would not be surprised if it were cracked.

 

Thanks. Will do. If heat exchanger is cracked, are they repairable or do you replace?
John

 

The heat exchanger MIGHT be under warranty. If it is, you would be liable for the cost of shipping & labor to replace it. If not under warranty, it would probably be better to replace the furnace than the heat exchanger. On some models, the manufacturer will offer the cost of a heat exchanger toward a new furnace.