Furnace just keeps purging

Problems related to residential installations.

Furnace just keeps purging

Postby budwha » Sat Jan 22, 2011 12:28 pm

I have an older Carrier natural gas furnace( model # 398AAW0360800). When I turn the thermostat to heat the purge fan comes on and the pilot ignites.......thats it...the main valve doesn't seem to come on and it just purges forever. There are no LED lights to help troubleshoot.
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- Furnace just keeps purging

Postby erockone » Sat Jan 22, 2011 6:40 pm

is that a smart valve?
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- Furnace just keeps purging

Postby budwha » Sat Jan 22, 2011 10:45 pm

I found the problem....the flame sensor on the pilot light is no good. I temporarily jumped it out and it worked. Will replace the pilot assembly.
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- Furnace just keeps purging

Postby Javatango » Thu Feb 03, 2011 4:20 pm

I had the same problem with my Lennox gas furnace. Have you tried power cycling the furnace? Power cycling fixed my problem temporarily but I eventually needed to replace the control board.
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- Furnace just keeps purging

Postby nomadpeo » Sat Feb 05, 2011 8:28 pm

i was a little puzzled by that statement myself dilkey. if you jumpered out a control with two wires near the burner, it could be a safety device - maybe a rollout sensor. if you do not understand these controls and what they are for, you could be creating a fire hazard. there is nothing there that should be jumpered to allow the furnace to run.
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