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Old 10-29-2019, 03:55 PM   #1
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THOR #16811
Heater

Hi and thank you for all the information available here, I have Thor Axis 25.2 2016 the heater is not working have check all, The thermostat kick in and that's all I get propane on and thermostat on fan on position, Any help will really appreciated, Have remove the board and clean it out and still no heat,,,,,
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Old 10-29-2019, 05:03 PM   #2
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Originally Posted by Traveling man View Post
Hi and thank you for all the information available here, I have Thor Axis 25.2 2016 the heater is not working have check all, The thermostat kick in and that's all I get propane on and thermostat on fan on position, Any help will really appreciated, Have remove the board and clean it out and still no heat,,,,,
Need more info...
Does fan go on when thermostat moved to heated position?
Do you hear the spark inside the furnace which tries to light the propane?
Or
Does nothing, nada happen when thermostat is moved to heated position?
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Old 10-29-2019, 05:08 PM   #3
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No the fan does not come on and no spark
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Old 10-29-2019, 05:10 PM   #4
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THOR #7035
The Thermostat's "FAN" control only controls the Air Conditioning fan; not the heater's.

In order for the heater to work you must have 3 things:

Propane - Valve turned on
12 VDC to the heater (check fuses)
The thermostat set to a higher temperature than ambient temperature.

If you don't have propane - your stove won't light either
If you don't have 12 VDC to the heater (which then supplies the thermostat); your Air Conditioning won't work either.

When things work correctly:
The thermostat tells the heater to turn on
The heater fan turn on which activates a sail switch to tell the heater control board the fan is running
The heater control board opens the electric propane valve to aloow propane to flow and starts trying to ignite it (click, click, click)
If the igniter does not sense a flame with a few seconds the propane valve shuts off and the lighting cycle times and and restarts.
After 3 failed attempts to light the controller goes into an error state and must be reset to try again.

So where are you at in this cycle?
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Old 10-29-2019, 05:11 PM   #5
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No the fan does not come on and no spark
Does the AC work? Per my post above check 12 VDC to the heater.
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Old 10-29-2019, 05:14 PM   #6
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I have propane the ac work fine the stove work good when turn on the thermostat to heat i can hear a click on it but that it ?????
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Old 10-29-2019, 05:33 PM   #7
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Originally Posted by Traveling man View Post
I have propane the ac work fine the stove work good when turn on the thermostat to heat i can hear a click on it but that it ?????
start by taking off the outside cover on the side of your RV, and then push (on/off) the reset button.
Then see if now the fan comes on

if no fan, then it may be a circuit board issue
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Old 10-29-2019, 05:37 PM   #8
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I have done that and clean the board looks like i may need a new board thank you for all the input Sir TFryman Really appreciated
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Old 10-29-2019, 07:21 PM   #9
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What thermostat do you have? If its the digital dometic, I have had mine behave very strangely, looking like the AC or Heatpump had failed. Turned out to be a loose connection in the thermostat itself. Just pulling the thermostat face off the mount and reseating solved the problem I had.
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Old 10-29-2019, 08:56 PM   #10
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i have the Coleman 7330F3852 Thermostat that came with the rv loco
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Old 10-29-2019, 08:59 PM   #11
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i have check all the wires looks more that i have to replace the board i check it out
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Old 10-29-2019, 09:38 PM   #12
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i have check all the wires looks more that i have to replace the board i check it out
Yeah, that's what I'm thinking as well.
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Old 10-29-2019, 11:28 PM   #13
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I have done that and clean the board looks like i may need a new board thank you for all the input Sir TFryman Really appreciated
When you say 'clean', what do you mean? Never touch the board with anything unless you're really really good with electronics and spark chasing the circuits like the best of them. I cleaned the corrosion off my board once. I wound up replacing it.

Just something shared.
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Old 10-30-2019, 01:56 AM   #14
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i use contact cleaner and dry it out but looks like i need a new board, So i am ordering the new board.
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Old 11-06-2019, 10:54 PM   #15
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Same thing happened to my ‘16 Vegas 25.2 last winter. I needed to replace the control circuit in the furnace. Cost about $130 at my local repair shop to get it done.
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Old 11-06-2019, 11:51 PM   #16
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Check with the manufacturer of the furnace. Could be a warranty. But I am sure you would have to have it diagnosed by an authorized dealer. My fifth wheel furnace went out while on a trip to Michigan. The manufacturer paid about 100 bucks on the labor and supplied the board.
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Old 11-06-2019, 11:53 PM   #17
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We have an axis 24.1 2016
Same issues nothing happens when the thermostat is moved.
It turns out that the original boards were junk. Local RV shop does about one a week.
Replaced the board!! no issues for the past two months..... it runs a fair bit when we use it in this cold Weather!
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