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Old 09-13-2019, 09:28 PM   #1
Brand: Thor Motor Coach
State: Massachusetts
Posts: 41
THOR #11935
Mirimar furnace blower won’t turn off

I have a 2016 Thor Miramar 15 to all of a sudden with all the thermostats off the main furnace blower keeps running

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Old 09-13-2019, 10:17 PM   #2
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Long & Winding road's Avatar
Brand: Thor Motor Coach
Model: 2017 Axis 25.4
State: Arkansas
Posts: 2,610
THOR #12231
Were you just runnig the Heater? if so did it work okay?

The fan will stay on for like 2 minutes after you turn it off to cool it down (or after it reaches the temp setting). Perhaps this sensor that tells it to run is defective?

Do a search on you tube for fixing an RV heater. I came across one last year that was very informative. Perhaps this will help or someone else can chime in with the correct answer.

2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor
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Old 09-13-2019, 11:11 PM   #3
Senior Member
Brand: Thor Motor Coach
Model: '17-Vegas 24.1
State: California
Posts: 1,061
THOR #13362
So is it running now? How did you turn it off?

Usually it’s either the computer board inside the furnace (gets damp and/or shorts out), or it’s the thermostat inside your coach that is not functioning correctly.

Suggest you start with the thermostat and play with it a while.
The computer board isn’t something that most of us can test.

That said, search this Forum for furnace problems.
'17 Vegas 24.1
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Old 09-14-2019, 04:00 AM   #4
Senior Member
Brand: Thor Motor Coach
Model: Citation
State: Texas
Posts: 393
THOR #8139
Rain is probably the NUMBER 1 cause of furnace trouble!

Here's a picture of our circuit board after I cleaned it with contact cleaner, cleared some of the trouble.

I replaced it, easy DIY
here's the link.
Ignitor Board Index page
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