Trouble - Goodman GMP100-3 Rev B - HVAC - DIY Chatroom Home Improvement Forum

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Old 10-24-2006, 10:16 AM   #1
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Trouble - Goodman GMP100-3 Rev B

This is my first post (newbie). Greetings.

I'm having trouble with my furnace. Goodman GMP100-3 (Rev. B).

This past weekend, my wife and I noticed the furnace was running but there was no heat. The blower was functioning properly, but no flames from the 4 flame ports (sorry, I not sure of the proper term). I followed the instructions on the unit to restart the direct ignition system. I shut off the switch on the side of the furnace (electrical). I shut off the gas valve and the gas control switch (moved from "ON" position to "OFF", and I turned the thermostat to "OFF". I waited the recommended 5 minutes and turned things back in the order listed in the instructions. I tried this 3 different times. Nothing. Blower still worked, but no flame. I called for a service call. In the meantime, I removed the fuse from the control board, inspected it, and returned it. It was fine. The final time I tried the automatic ignition procedure, I waited 20 minutes, instead of the recommended 5. This time it worked. The igniter glowed brightly and the 4 gas ports fired up. I tried it again. Same result. It's been working ever since. The fault code LED glows a constant red. Per the fault code chart, this is the sign for normal conditons, so the board seems to be ok. I decided not to cancel the service call just to have a trained professional look at it. He said the limiter had probably tripped. He told me these will do this only so many times and then stop resetting themselves (safety measure). He also mentioned the furnace was not drafting properly. He also told me he doesn't usually recommend replacing anything but the igniter and maybe the flame probe on the Goodman's. He said they are junk. He mentioned the furnace probably wouldn't make it through the winter. He did seem fair and honest. He came recommended from a neighbor. I'm not sure of the age of the unit (it has "1993" stamped on the product info. tag inside the unit). I'm trying to decide whether to just replace it with a Rheem (he recommended this unit) or keep my fingers crossed with this one. Any suggestions as to other causes of the failure to ignite? The flame probe seems to be in good shape (no oxidation) and the igniter glows a nice continuous orange (no cracks).

Thanks in advance for any help.



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Old 10-24-2006, 12:27 PM   #2
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Hi cstelter

I will see if I can field this one, I am not sure junk is a harsh enough word for Goodman but lets keep it rated G. The limit that most often causes your failure is the vestible limit. This sets almost dead center of the furnace. Goodman uses the ones with a plastic mount, that right there tells you something. The limits that Carrier sells as a universal will go right back in place of it. If you do decide to repair this problem, make sure that you replace it with one of the same temperature. Rheem is a good unit but Carrier has more options as far as efficency. Remember when buying, utility's are not going down, spend your money once.

Good luck, Let me know if you need further assistance.


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