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Old 12-02-2009, 09:13 PM   #1
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Ducane forced air heater and ac


We have a Ducane forced air heater and ac model FPBB100A4. The heater will not fully kick on, but the ac will. The heater gas valve opens, pilot ignites, inducer blower runs, but the indoor blower does not. In ac mode it all runs fine. We tested the voltage to from the contactor in heater mode with the unit in on position and temp set to 75 with a 59 inside temp and found no power coming out of contactor. We replaced the contactor and are still having the same problem, where is the filter and is there some kind of layout to be found out there so we can locate parts on this thing? I have searched the internet. Thank you!!!!

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Old 12-02-2009, 09:21 PM   #2
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Ducane forced air heater and ac


Found that contactor engages when ac is on, why does it not engage in heater mode? The contactor has to be engaged manually in heater mode for indoor blower to kick on. There is also a small scorch mark on the back of the board behind the relay, could this be effecting it?


Last edited by jole; 12-02-2009 at 09:23 PM.
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Old 12-02-2009, 09:29 PM   #3
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Ducane forced air heater and ac


We have a Ducane forced air heater and ac model FPBB100A4. The heater will not fully kick on, but the ac will.

The heater gas valve opens, pilot ignites, inducer blower runs, but the indoor blower does not. In ac mode it all runs fine. We tested the voltage to from the contactor in heater mode with the unit in on position and temp set to 75 with a 59 inside temp and found no power coming out of contactor.

We replaced the contactor and are still having the same problem, you have to manually engage it in heater mode to get the indoor blower to kick on. There is a small burn on the back of the board behind the relay, could this be the cause?

Where is the filter and is there some kind of layout to be found out there so we can locate parts on this thing? I have searched the internet. Thank you!!!!
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Old 12-03-2009, 06:38 PM   #4
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Ducane forced air heater and ac


Scorched mark on the back of the board is probably your blower relay for heating. Time for a new board.
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