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Old 09-02-2021, 03:13 PM   #1
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Brand: Thor Motor Coach
Model: Axis 25.2
State: New York
Posts: 44
THOR #15036
Roof exhaust fan

The rear roof fan stopped working. All fuses in fuse panel are good

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Old 09-02-2021, 03:34 PM   #2
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Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 3,506
THOR #6411
Quote:
Originally Posted by Glenn Briglio View Post
The rear roof fan stopped working. All fuses in fuse panel are good
Time for a voltmeter.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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Old 09-02-2021, 03:52 PM   #3
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Brand: Thor Motor Coach
Model: 24TF Compass / Mercedes
State: New York
Posts: 184
THOR #17969
Glenn, what you will need to do is determine if you have 12 volts at the fan. If you do, then check to see if voltage is getting all the way to the fan motor. If it is, your motor is shot and needs to be replaced. If you have an interlock that prevents the motor from running unless the cover is open, make sure to check that. If there is no voltage to the fan then, start backtracking to the switches that turn it on and off to determine which switch might be defective and needs to be replaced. Your units electrical diagrams from Thor will give you the basic layout for the wiring of your unit. Individual switches can be checked using the ohm function on the multimeter. Make sure you have no voltage when using this function and the wiring is disconnected so not to get a false reading. There are many video's on the net on using a multimeter if you are not sure. If all switches are good, then you may be forced to check the individual wires to make sure a varmint has not chewed things apart. Again, you can use the voltmeter to determine voltage and connectivity using the ohm scale. Be slow and methodical and you will find the issue.
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Old 09-02-2021, 04:04 PM   #4
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Brand: Thor Motor Coach
Model: Citation
State: Texas
Posts: 905
THOR #8139
NOT sure which fan you have!

I had to change our switch/circuit board a couple of yrs ago.
Easy to take apart.
Easy to test 12v & ground (t ok) with a multimeter (volt meter).
Easy to test motor (t ok) = failed switch/circuit board.
Easy to find and order new board.
not easy to put back together, needed 3 hands .
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