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Old 01-07-2019, 04:36 PM   #16
KReed464
Junior Member
 
Brand: Thor Motor Coach
Model: A.C.E. 30.3
State: Massachusetts
Posts: 18
THOR #12107
Hope this helps.

I hope this helps, I recently had a similar issue. The heat would attempt to come on but after about 30 seconds it would shut down.

Turns out there is a microswitch on the furnace from the outside. It senses the airflow and then allows the propane to ignite, if it fails to activate, the furnace shuts down.

I ordered a new switch and while I was waiting I decided to take the existing microswitch out. There was some dust that prevented the switch from activating, I simply blew the dust out and reinstalled it and it worked just fine.

It was very simple and a free fix!

Good Luck!
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