BAC Forum
General Boards => Technical Support => Topic started by: Dennis Clevenger on May 09, 2025, 06:19:51 PM
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This Hurricane had finally become quite reliable the past few months as we make our trek north. We are now at the northern Oregon coast and a problem became evident when we got here. The furnace starts like normal, the register fans blow over the heat exchangers, then after about 5 minutes the furnace goes off. No red light, no LED errors on control board. The registers continue to blow cool air. Let it sit long enough and the furnace will fire up again with the same results. I’ve tested with the front zone Duo-Therm thermostat and then with the rear, so I guess I can rule out a thermostat issue. Nozzle cleaned and all hose connections snug. We are going to be in Vancouver for a few days so may drop by ITR, but though I’d see if any of you guys had any suggestions. It seems there should be some signal sent from the furnace to the thermostat to shut down the fans when thermostat satisfied with reaching heat level. BTW, this is an older Hurricane, 1998. TIA
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Dennis
The heat exchanger fans are controlled by relays on the control board.
One of two things are happening here .
1) the thermostat is not satisfied ( still calling for heat) and the circulation pump has stopped pumping leaving the heat exchanger to blow cold air.
Possible relay on the control board or faulty ( intermittent circulation pump).
2) the thermostat has satisfied the call for heat ( room up to temperature and shut off ) and the fan has not shut down .
Possible cause a sticking fan zone relay on the control board .
The Hurricane manual in the coach assist library will have a wiring diagram to help you under stand the controls a little better.
If it is a stuck relay tapping it may free it.
Hope this helps
Eric
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PROBLEM FIXED! Today ITR replaced the circulation pump and all is well, now. Something was hinky in where the wires enter. Solder contacts or brushes? Anyway, I kept the old pump to maybe rebuild someday for a spare. They installed an Oasis brushless pump.
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Dennis
Good to hear your up and running again.
Eric