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Old 03-15-2021, 03:21 AM   #1
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Brand: Thor Motor Coach
Model: Challenger 37TB
State: Connecticut
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THOR #3785
HELP! Thermostat screen blank and temp is dropping to 18!

Hi All!

I turned the heat on a week ago and it was fine, I brought it to my mechanic to give a spring check up and test all the systems, and now the heat/AC thermostat is blank screen.

He said that he was running fine and the burner just had some debris in it. Is there some thing he couldíve turned off that I need to turn back on?

Temperature is going down to 18 and Iím D winterized. Iím worried about stuff freezing.


Bill

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Old 03-15-2021, 03:34 AM   #2
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THOR #6903
Get a space heater going if you're plugged in

If not generator until you get the heat back

Propane turned on?

Thermostats set for heat?

Go through your check list
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Old 03-15-2021, 03:37 AM   #3
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Thank you. Yes I have two heaters going inside. Iím worried about the plumbing underneath. I poured antifreeze in the drains and Iím starting to winterize again in case I canít figure out the thermostat.

Itís nothing from the check list. Has to be something turned off.

Bill
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Old 03-15-2021, 04:43 AM   #4
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THOR #8139
Is it just the thermostat that is blank?
all the other 12v stuff works?
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Old 03-15-2021, 04:45 AM   #5
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Yes. Everything else seems fine.
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Old 03-15-2021, 04:47 AM   #6
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THOR #7035
I assume you have a digital thermostat?

If so, and it's an OEM thermostat like this:


it's blank because it isn't getting 12 VDC from the furnace. There is an On/Off/Reset switch on the furnace behind the outer panel It should have 12 VDC both to the in and the out of the switch IF you have 12 VDC on the house DC buss and the appliance fuse on your converter/breaker panel is not blown.



If it is an aftermarket digital thermostat like this, it may just need the AA batteries replaced.
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Old 03-15-2021, 05:02 AM   #7
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THOR #8139
Open the cabinet so heat can get under the sink, same for the bath.
Close the slides.

We were fine at 0* in N Texas till we lost electricity because ERCOT started a rolling black out .
Guess what happens to a gas fired electric power plants source for natural gas get hit with a rolling black out YEP no nat gas to the elect plant shuts the elect plant down
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Old 03-15-2021, 08:37 PM   #8
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THOR #3785
Quote:
Originally Posted by 16ACE27 View Post
I assume you have a digital thermostat?

If so, and it's an OEM thermostat like this:


it's blank because it isn't getting 12 VDC from the furnace. There is an On/Off/Reset switch on the furnace behind the outer panel It should have 12 VDC both to the in and the out of the switch IF you have 12 VDC on the house DC buss and the appliance fuse on your converter/breaker panel is not blown.



If it is an aftermarket digital thermostat like this, it may just need the AA batteries replaced.


Thank you so much! Iím just a little unclear about the fix. Yes, it is an OEM thermostat. So I go to the panel on the outside of the RV and do what?
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Old 03-15-2021, 08:59 PM   #9
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THOR #7035
Open it and find the switch. Make sure it is in the On position. Measure voltage at the switch to insure you have 12 VDC there. If you don't have or don't know how to use a voltmeter, call a mobile tech.
Quote:
Originally Posted by BillT View Post
Thank you so much! Iím just a little unclear about the fix. Yes, it is an OEM thermostat. So I go to the panel on the outside of the RV and do what?
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Old 03-16-2021, 02:13 AM   #10
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THOR #1469
Also check fuses and breakers inside.
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Old 03-20-2021, 08:10 PM   #11
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THOR #16471
Unhappy Lost another one.

Man I hate it when a OP gets lost in the ether of the forum.... there must be a hole in the internet they fall into, always the same, no outcome of their journey.
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