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Old 12-15-2010, 09:12 AM   #1
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furnace on but temp not stable

We are having some very cold (for us) nights and days here in West Central Ga. We have set the temp so that the furnace will come on if it drops below a certain temp. At first this seemed to be holding pretty steady, but after a few nights my DH noticed that the temp wasn't holding anymore. He set the furnace at 55 and each time he checked the temp was 10 to 15 degrees lower. He runs the temp up and the furnace does come on but when he checks back it seems that it isn't coming on routinely to keep the temp up to the setting. Has anyone had this problem before? This is our first winter and we haven't used the furnace much at all, so it may be a lack of knowledge on our part. Suggestions, advice are greatly appreciated.

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Old 12-15-2010, 09:55 AM   #2
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Bob if your living in coach I would put temp up where your wife is comfortable.
Cold weather you will get drafts from windows and if not thermo pane more cold, especially your windshield.
Do you have return vents with filters they may need to be clean.
Your furnace may also have to keep your holding tank & plumbing areas warm to prevent freeze ups.
If you have slides and can live with them in would require less heat space when it warms put them out.
When we were in IN. last January was 1* for 4 days and wife was warm as toast had therm up 72* slides in it was snowing.

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Old 12-15-2010, 11:00 AM   #3
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007, thanks so much for the response, sorry I wasn't clear, we are just trying to keep the pipes and tanks from freezing, we aren't living in the motor home.
We are just concerned because we don't know if there is anything wrong with the furnace, and if it lets the temp drop, will something freeze. We didn't winterize with the RV antifreeze because we do plan to use the coach.
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Old 12-15-2010, 12:22 PM   #4
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digital or analog thermostat?
Digital ones will keep the heat more even...
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Old 12-16-2010, 07:50 AM   #5
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Are you saying the thermostat setting changes, or that the furnace is not keeping the interior at the set temperature? And the furnace has shut off (not running continuously)?

If the latter, it is likely the furnace heat is directly warming the thermostat enough to make it shut off, while the rest of the coach remains cold. Make sure no heat duct is blowing on the thermostat, or the remote temp sensor if your t-stat has one.

Look at the temp on the thermostat itself - set temp vs the ambient that the t-stat sees. As long as the t-stat thinks it is warm enough, it won't call for more heat.

RVs heat & cool very unevenly, especially in extreme temperatures. They are drafty, leaky and have numerous hot/cold spots.
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Old 12-16-2010, 08:55 AM   #6
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The thermostat is digital and it is right across from where one of points that the furnace vents out. This could very well be causing the difference in the temp setting and the temp inside the coach. We will look into if there is anything we can do to divert the direction the warm air is blowing to try to better control the temp. Today it is suppose to be 60 here, at least we will have a break from worrying for a few days.
Thanks again for the support we have received from this forum. We hope that we will be able to return the favor someday. We are still learning so much about the coach.
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Old 12-16-2010, 09:31 AM   #7
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If it is set at 55 and it does drop 10-15.
If you are not in it 40 will still keep things from freezing.
If the furnace puts heat into the basement area where the tanks are.
My rear furnace is the one that does that.
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Old 12-16-2010, 04:12 PM   #8
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If you have sensors mounted on your walls, take the plastic covers off and blow the dust off. They get dirty and effect heating. Solved our problem.

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