Bryant Gas Furnace Problem
Hi,
I have a Bryant 373LAV Gas furnace that has stopped working. There are a couple of issues with the furnace and I'll try to explain what is going on.
For now, the heat does not turn on. The thermostat (White-Rodgers Comfort Set II) shows 60 and the heat is set at 70.
So I opened up the furnace and started poking around. The blower does not turn on for some reason. When I turn the heat on, then I hear the noise that tells me that the blower is trying to turn on. So I give the blower a gentle start and it turns on. OK... problem 1 is I need to get the blower serviced (most probably it has collected dust and needs proper grease / oil so that it can start smoothly).
Exactly 90 seconds after the power switch is turned on, the inducer (the small motor) turns on and within a few seconds (I think 15), the ignitor turns on. I can hear the gas valves open and the flames come on. The ignitor then turns off. Also, as soon as the inducer motor turns on, the blower turns off (it still keeps on rotating, obviously).
A few seconds after the flames come on, I can hear the relay click and this turns the blower back again. So far so good.
The problem that happens now is that after a few minutes (about 4 minutes from the turning on of the power switch), the burners turn off. The blower will stay on for a couple more minutes and then the blower will also turn off.
I have replaced the thermostat with another one from upstairs, and it still gives me the same problem - the heat won't stay on.
The control board goes through the appropriate cycle of triggering on / off all the relays when I go through the 'test-cycle'.
Any kind of help to stay comfortable in this darned cold weather is really appreciated.
Thanks a lot.
Sandip
|