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Old 01-20-2008, 03:34 PM   #1
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In the middle of the night, we discovered that the furnace stopped working. The thermostat was blank. The only thing that worked was the AC fan would come in when I switched to fan only.

I got up this morning to try to troubleshoot the problem and the heat came on as soon as I turned it on.

With a blank temperature screen on the thermostat, I am thinking that maybe the thermostat shut down and wouldn't let the furnace start.

Has anyone had any experience with a situation like this? If so, what was the problem and how did you fix it?

Thanks in advance.
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Old 01-20-2008, 03:34 PM   #2
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In the middle of the night, we discovered that the furnace stopped working. The thermostat was blank. The only thing that worked was the AC fan would come in when I switched to fan only.

I got up this morning to try to troubleshoot the problem and the heat came on as soon as I turned it on.

With a blank temperature screen on the thermostat, I am thinking that maybe the thermostat shut down and wouldn't let the furnace start.

Has anyone had any experience with a situation like this? If so, what was the problem and how did you fix it?

Thanks in advance.
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Old 01-20-2008, 03:54 PM   #3
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I am going to link this post over to the general motorhome forum for more exposure.

Ken
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Old 01-20-2008, 04:04 PM   #4
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Strange, but it could be that the circuit board for the thermostat is acting up.
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Old 01-20-2008, 05:02 PM   #5
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What was the temp when it shut down? When it reaches a certain temp, the electric heat will go off and it should automatically switch over to gas ( mine doesn't tho) I need to figure that one out myself.
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Old 01-20-2008, 05:18 PM   #6
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WHen my Colemand/TrueAir thermostat went blank, the only fix was a new thermostat.
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Old 01-20-2008, 07:41 PM   #7
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I think if your house batteries get extremely low your thermostat will shut down ...
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Old 01-21-2008, 12:30 AM   #8
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mrschwarz, if the thermostat did come back on and operate properly, you may have a bad connection at any point in the 12 volt control circuit. Intermitant problems are hard to troubleshoot due to the fact that unless the problem is current everything will check good.
Please give us as much information as you can. We will need to know the voltage source you are connected to, start up temperature inside coach, temerature setting on thermostat, outside temperature at start up and the temps again at time the furnace does not come on. Thanks.
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Old 01-21-2008, 01:36 AM   #9
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The voltage source was the 12-volt system, which was connected to the house batteries and 12-volt converter at the time. The outside temperature was about 20? at the time. The inside temperature was 50? and the thermostat was set to 65?.

I am not quite sure what you mean by startup temperature, other than it was about 67? when we went to bed.

Thanks for your help.
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Old 01-21-2008, 04:25 AM   #10
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Like AF Chap, my fix was a new thermostat. Have had 3 now.
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Old 01-22-2008, 12:03 AM   #11
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You can certainly change out the t'stat to see if it correts the problem; it is not too expensive and is worth the try. IF however it does not fix the problem, I would recommend you have a qualified service center take it form here. You may even have some dirty DC coming from charger. Some control boards do not like dirty DC and will not function properly with it. Give it clean DC power and it works fine. Good luck and keeps us posted.
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Old 01-22-2008, 01:44 AM   #12
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As long as it's not too expensive, I'm going to try replacing the thermostat.

Thanks everyone for your suggestions!
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Old 01-23-2008, 03:23 AM   #13
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I lost both electric furnace and propane heat. Turns out the electrical wires at bottom of electrical heater came loose and thermo on propane sensor gave out at same time.
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Old 01-23-2008, 04:10 AM   #14
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That is a passel of problems to happen simultaneously.
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