Conquest 80 gas furnace keeps cutting out

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Old 12-18-10, 05:34 PM
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Conquest 80 gas furnace keeps cutting out

Conquest 80 gas furnace keeps cutting out

Make Heat Controller, Inc, Conquest 80
Model #GMDA-75E3N
Serial #GA50302F400313984

Furnace man has cleaned the sensor and replaced the igniter and replaced the circuit board. Furnace still cuts out and restarts.
Sequence:
Fan comes on audible click sound - yellow flame lights - blue flame thru the holes lights - blower comes on.
Blower stops sounds like the fan is still on. After 1-2 minutes it starts up again as follows click yellow flame blue flame blower comes on.
Furnace usually stays on at 2nd attempt but sometimes takes 3 and if it goes into a 4th attempt the furnace shuts down completely.
What is causing this?
I am 75 yr old female so bear with me while I try to give you the info.
Thanks.
 
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Old 12-18-10, 07:08 PM
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You need to identify what is shutting the furnace off.

I'd start by using a multimeter to check to see if the thermostat or the pressure switch is opening the circuit and shutting the furnace off.

Do you have a multimeter that measures AC voltages so you can check these things?
 
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Old 12-19-10, 05:03 AM
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Thank you for your advice.
No, I don't have a multimeter but the furnace man is returning to replace the circuit board again and I will have him check that out.
When the problem continued after he replace the circuit board last week he called the furnace maker and they said it had to be the circuit board and are sending him another board.
 
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Old 12-19-10, 09:40 AM
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Sena Smh10

If the furnaces are cutting out then we should move to electric and nuclear power energy efficient sources.
Sena smh10
 
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Old 12-19-10, 11:01 AM
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Sena,

You are being gratuitously cruel to inject a pointless political comment into a thread by someone who has no heat and is trying to get some help.
 
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Old 12-19-10, 04:26 PM
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Thanks Pioneer, I put her on my ignore list so she won't bother me again.
 
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Old 12-19-10, 05:08 PM
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Of course it could be a bad circuit board, and new parts are bad right out of the box occasionally.

I hope your guy did a good job of diagnosing the problem.
 
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