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Old 05-17-2025, 04:21 PM   #1
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Dometic DFSAD12 Furnace Won't Light

We have the above furnace in an Air Stream Base Camp 16X. It worked perfectly on our trip to Alaska plus the first 2 nights here, now it will not light. The fan runs but no gas valve click nor flame ignition. Any ideas?
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Old 05-17-2025, 07:15 PM   #2
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An RV furnace needs to see the sail switch closed before the ignition cycle starts .

Do you have the manual for the furnace ?

The issue can be ;
A bad sail switch .
Low fan speed ; due to low battery voltage or problems with the motor.
Restrictions in the furnace output vent , or cold air return ; that might slow the air flow through the furnace fan .
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Old 05-19-2025, 10:58 AM   #3
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The sail switch is the most likely. I'm taking a look today to see if I can access it without pulling the unit out. So far we are getting along with the heat strip on the ac unit.
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