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Old 01-29-2013, 07:16 PM   #16
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furnace runs for a bit then no fire


OK so I got the plug off and checked the pressure was 3.2. I brought it up to 3.5 and of course it does the same thing. It pops the limit switch just before the fan starts, but then after the fan run it will refire and run for 45 min or so and then give the low voltage error code. This time I ran it with the furnace doors open to make sure there was not a air problem. Im at a lost! the only thing I can think of is the board. Any thing else I should try. oh yeah I did check the exhaust and it was 148 just after the fan but went down quick as I checked further up the stack, so it is not blocked

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Old 01-29-2013, 08:58 PM   #17
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furnace runs for a bit then no fire


148 is too high for a condensing furnace. What is the temp rise. 135 is a max, with 120 to 130 preferred.

Sounds like it could be the board bringing the fan on too late. but your flue temp is incorrect for condensing furnace. So check air flow again. Did you look at both sides of the evap coil.
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Old 01-30-2013, 08:20 AM   #18
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furnace runs for a bit then no fire


according to the owners manual the blower starts 45 sec after the flame is lit, that is about what it is doing. it was 70 coming in and 150 going out.

yes I checked both sides of the coil and even ran it with the doors open. It would still had to go across the coils though.
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Old 01-30-2013, 06:59 PM   #19
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furnace runs for a bit then no fire


Almost sounds like a clogged/restricted secondary heat exchanger.
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Old 02-01-2013, 10:26 AM   #20
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furnace runs for a bit then no fire


how do I check inside the exchanger without removing it or buying a expensive camera?
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Old 02-01-2013, 03:54 PM   #21
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furnace runs for a bit then no fire


Remove inducer and pull the collector box cover, and look at it.
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Old 02-01-2013, 07:00 PM   #22
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furnace runs for a bit then no fire


tempeture rise according to you is 80 thats to high and if you say blower starts 45sec into heat cycle....why do you think its the board... did you try changing blower speed to see if it changes temp rise...ben sr

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