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Old 11-25-2022, 02:29 PM   #1
Barnzie
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Montana 2018 3700LK 5th Wheel

Hello everyone any suggestions would be appreciated. My furnace won't come on the thermostat will start the aircond heat pump so thermostat seems to be okay.
 
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Old 11-25-2022, 04:29 PM   #2
Daryles
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Need a little more info.
What happens when the fan is set to AUTO and furnace is selected?
IF it blows cold air for a few seconds and quits, most likely a sail switch.
Look in the files section and download the furnace troubleshooting manual.
Follow the troubleshooting steps based on the symptoms you are experiencing.
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Old 12-12-2022, 06:42 PM   #3
Lkasper12
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Furnace problems

I just had the same problem happen while i was camping in Blueridge GA. My issue ended up being the control card that had become corroded on the bottom of the circuit board. Ended up changing the card. There is a reset logic switch near the control card that can be switched off and then back to reset. Make sure you place the switch back into reset as it does not spring return (I found this out after additional troubleshooting because the card changeout didn’t work initially!). Remember, start with the simplest solution to the problem and work out from there. Oh, BTW there is a fuse that feeds the circuit board. Make sure its still good.

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Old 12-13-2022, 06:54 PM   #4
Kevin and Reeva
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Here's a video on you tube on troubleshooting the furnace.https://youtu.be/0t8vRuGdZLw
Darren with My RV Works does great videos on almost everything in the rig that can break.
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