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Old 11-14-2008, 02:50 PM   #1
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Problems with Carrier Furnace circa 1990

Hello. Hoping someone on here may be able to give advice. We have a 1990 Carrier Furnace in our home that has stopped working. It started acting up last weekend and has come on intermittently. The repairman thinks we need a new control board, as well as to replace the cooper pipe for the gas line to galvanized steel line including filter catch and gas valve. When setting the temperature higher, the furnace will click, click, click, looks like the pilot tries to light and then everything stops. It was working fine for 2 days after the repairman cleaned out the pipe, but has completely stopped working now. Could it just be we need to replace the cooper pipes or is it really time to replace the control board? Any advice is much appreciated!


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Old 11-14-2008, 04:16 PM   #2
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is this a propane furnace? if so copper is what is used you never use galv for gas.The click,click is the spark trying to light. Make sure the spark is arcing where it needs to be in order to ignite the gas. (near where the flame burns) Old carriers are famous for dirty pilots and the flame switch getting dirty, as well. If the flame switch is dirty pilot will light but main gas wont come on. If pilot is dirty the main gas will come on than go off again and keep cycleing if all else fails you can light it by hand where the spark arcs when you hear it arcing it will heat untill the first off cycle


Last edited by kennzz05; 11-14-2008 at 05:09 PM.
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Old 11-14-2008, 05:02 PM   #3
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Might just be the pilot assembly, needs cleaned or replaced.
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Old 11-27-2008, 05:58 PM   #4
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I hope you didn't pay for that service call and suggestion to replace gas piping.
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Old 11-27-2008, 06:32 PM   #5
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Concur about the pilot assembly. If this isn't LP but Natural Gas, the scaling inside the copper tube could be occurring. Can also occur with LP if the the filler gas they sometimes use can be very caustic.

I've read reports where crooked LP producers used ammonia nitrous gas. Ammonia and up the furnace and the copper tube.

So the copper tube just MIGHT need replacing.
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