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Old 02-22-2007, 11:15 AM   #16
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Comfortmaker furnace won't turn on


Any pressure switch with the same pressure setting as the original will work. And if the tech has been replacing pressure switches every time this error comes up, its time for a new tech. A pressure switch is a safety switch; if it is not "switching", then it is doing its job. You probably have a blocked vent or a bad inducer motor or wheel. If you are bypassing the pressure switch, you could be allowing gasses to enter your home and they could kill you!
Find a different serviceman, and tell him to clean the vent, heat exchangers, or replace the inducer.

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Old 03-02-2007, 04:38 PM   #17
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Comfortmaker furnace won't turn on


Thanks so much for the input. I will definitely have to get a new tech. I hope the next one will know what to do. It seems like there are alot of problems with the 90's Comfortmakers. Too bad you don't live in Atl and I could pay you to fix it. You have given me more info than any one. Thanks again for you help. Sunlzrd
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Old 04-04-2008, 06:16 PM   #18
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Comfortmaker furnace won't turn on


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Originally Posted by steelframe8459 View Post
I have a early 90's Comfortmaker condensing furnace, and periodically it won't fire up, especially if the furnace has been off for awhile ie: in the morning after being shut down to a lower tempature.
The exhaust blower will turn on but the burner will not fire up.
the only way i can the burner to turn on is to turn the switch on the side of the furnace off for a few seconds and then back on, then it will light.
Does anyone have any thoughts on whats causing this.
Any info would be greatly appreciated.


Thanks
I found by removing the plastic box on top of the gas valve and flipping it over that theres a bad soldered connection on one of the resistors ends, problem is I haven't found anyone who will sell this part of the gas valve and the last time I replace it , it cost me $500.00 2 years ago. I found the whole valve for $350.00 but this furnace is costing an arm and a leg to keep it running every 2 years then. I'd resolder the connections but the board shows slight signs of being burnt from arcing and trying to open the gas valve. Hope you had better results than I'm having.
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Old 11-10-2008, 08:30 AM   #19
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Comfortmaker furnace won't turn on


My daughter has the same Comfortmaker model GNJ075N12A1 made in 1995, installed in 1996. My husband could get it lit by blowing across the gas vent when the ceramic heater lit up, however since I had the HVAC guy come yesterday, we can't even get it to do that. I asked him to check the gas pressure and the vent--which he did not do. He only switched out the part that glows (igniter?), and it still wouldn't work. This cost me 2 hours of service, and I had to buy 3 space heaters. He said it could only be the control board and the whole inside of the furnace had to be rewired because the old parts were no longer made. The estimate is $577, and I have another company coming today. My husband wants to buy a new furnace, but that would mean a whole new system, and I love the AC--her bills are always below $100/month in the summer. My question is: I replaced the filter with a new 3M filter. Could this be interfering with the draft? Should I buy a cheaper filter? Maybe the exhaust fan doesn't have enough draft with the 3M filter? Could there be a bird's nest in the flue? Her water intake pipe to the house has had to be dug up twice in two years for tree roots(same house corner)--should I be calling the gas company? Yes the trees are gone.
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Old 12-14-2008, 10:55 AM   #20
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Comfortmaker furnace won't turn on


I have a FBF050B12G Comfortmaker furnace that is not maintaining fuel to the burners. I have found by accident, even after a service tech was out and changed the burner solenoid, that the Pressure Switch line from the pressure switch to the combustion burner is filling up with water due to condensation. About every day and a half I need to pull the line off one end and dump the water out of the line. This fixes the issue temporarily.

What I need to figure out now is why this is happening. I do not use a humidifier in my system. The basic, and I mean basic, manuals that I can find on line do not indicate if there is a drain line anywhere. Any ideas?

Last edited by Billiam67; 12-14-2008 at 11:16 AM.
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Old 12-14-2008, 11:01 AM   #21
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Comfortmaker furnace won't turn on


Yea, it doesn't have to be a pressure switch from IP.

Your tech, is a tech, he's a parts changer.
A real tech would look to see why the switch isn't closing.

They make adjustable pressure switches to replace OEM switches.
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Old 12-14-2008, 11:20 AM   #22
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Comfortmaker furnace won't turn on


The adjustable pressure switches to replace OEM switches, what will this do? I think I need to focus on the water issue in the line. Luckly the "service part changer" did not take me to the cleaners.


Thanks for the input.
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Old 12-14-2008, 11:39 AM   #23
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Comfortmaker furnace won't turn on


Can you say profitmaker?
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Old 12-14-2008, 12:14 PM   #24
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Comfortmaker furnace won't turn on


You adjust it to the pressure setting that the OEM switch was.

It saves having to carry 50 different switches.
Or having to order the OEM in.

No reason to make a customer wait till the next day for heat.
Just because of a pressure switch.

But, your tech needs to find what is really wrong. A pressure switch is a safety device.
Its probably doing its job, and saving your life.
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Old 12-15-2008, 09:13 AM   #25
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Comfortmaker furnace won't turn on


No one has mentioned the problem that causes all these symptoms on a ICP
furnace.

There is a combustion ring that the inducer draws air thru. The inducer has this combustion ring mounted to it's air intake. This could be either slipped out of position or be gone completely.

And to complicate the matters, it does not come with a new inducer. Has to be bought separately.

No ring, misfires and all the things that the posters have mentioned.
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Old 12-16-2008, 12:27 PM   #26
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Comfortmaker furnace won't turn on


I have a Comfortmaker, model GUD040A012AIM, and there was definitely an igniter problem as the igniter did not glow. I replaced it, and now it does glow, the gas does ignite, but for only 1-2 seconds, then shuts off. The red light on the controller flashes continuously after it goes out.

I at least know that the gas is working. There is a flame and the igniter works, but I cannot figure out why the main blower does not come on, or when the flame is quickly extinguished?

Any clues
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Old 12-16-2008, 02:47 PM   #27
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Comfortmaker furnace won't turn on


I read the post by FixIt50, and it is very helpful, except he does not mention this scenario where both the igniter lights AND the gas comes on.

Contrary to my earlier report the red light is now only flashing once at the start of the ignition process, when the thermostat triggers the furnace to turn on. All goes well, except the gas goes off after about 1-2 second of burning, so the relay does start the igniter, which does light the gas.

Once it turns off, there is no flashing light sequence.
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Old 02-04-2009, 06:00 AM   #28
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Comfortmaker furnace won't turn on


I too have the same problem. The combustion fan will kick on, igniter will glow but the pilot light will not ignite, thereby not heating the sensor to turn on the burner. It works sometimes but not all the time. I can manually start by removing the combustion chamber cover and, using a long handles lighter, put a spark in front of the pilot light. That will light the pilot and get it working. I will try and wire brush the sensor as suggested by #CARRIERMAN and checking the pilot orifice for deposits and will post again afterward.
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Old 02-04-2009, 08:17 AM   #29
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Comfortmaker furnace won't turn on


Quote:
Originally Posted by MrsT View Post
My daughter has the same Comfortmaker model GNJ075N12A1 made in 1995, installed in 1996. My husband could get it lit by blowing across the gas vent when the ceramic heater lit up, however since I had the HVAC guy come yesterday, we can't even get it to do that. I asked him to check the gas pressure and the vent--which he did not do. He only switched out the part that glows (igniter?), and it still wouldn't work. This cost me 2 hours of service, and I had to buy 3 space heaters. He said it could only be the control board and the whole inside of the furnace had to be rewired because the old parts were no longer made. The estimate is $577, and I have another company coming today. My husband wants to buy a new furnace, but that would mean a whole new system, and I love the AC--her bills are always below $100/month in the summer. My question is: I replaced the filter with a new 3M filter. Could this be interfering with the draft? Should I buy a cheaper filter? Maybe the exhaust fan doesn't have enough draft with the 3M filter? Could there be a bird's nest in the flue? Her water intake pipe to the house has had to be dug up twice in two years for tree roots(same house corner)--should I be calling the gas company? Yes the trees are gone.
I wonder how a bird's nest can be in the flue.

Wouldn't the bird die from direct and continuous exposure to CO?

Also, would an HVAC or plumber be appropriate for maintaining or checking a flue to make sure it's not blocked? Does anyone know?
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Old 02-04-2009, 07:26 PM   #30
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Comfortmaker furnace won't turn on


Ok, I the pilot orifice is ok. I unscrewed the ignitor/sensor/pilot assembly, removed the clip holding on the ignitor/sensor, turned on the furnace and held it infront of the pilot light. The ignitor was red hot and the gas was flowing but the ignitor would not ignite the pilot no matter where it was. I put a spark from a lighter infront of the pilot and it lite right up. The pilot flame was good and within the spec range stated in the tech support manual.

FYI - this is a replacement ignitor/sensor (MM-643KJ NITRD IGN ASSMB) which is different than the original (P/N 1009524 for a NUGM/GUK Series furnace), supposidly better. The original one burn out/quit working. I think I have to pony up and spend more money for the original type. Any ideas from anyone before I spent the $$?


Last edited by bloom42; 02-04-2009 at 07:31 PM.
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