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Old 09-12-2016, 09:30 AM   #1
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Furnace wont fire on Battery

My furnace works fine with I am plugged into 120V power source but when I am running on battery the fan comes on for a short time and then shuts off. My battery is new and fully charged and is at 13 volts so I don't think it is the battery. Could this be the sail switch?
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Old 09-12-2016, 09:38 AM   #2
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Have you checked the battery voltage at the furnace?
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Old 09-12-2016, 09:49 AM   #3
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Have you checked the battery voltage at the furnace?
No, I did not check the voltage at the furnace.
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Old 09-12-2016, 04:08 PM   #4
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I would do that.

There may be a bad connection somewhere coming off the battery.
Shore power/convertor is likely providing enough voltage to spin the fan fast enough for the sail switch to prove out. A loose connection in the battery wiring could cause lesser voltage at the furnace than what you are seeing at the battery itself causing the fan to run slow enough that it won't prove out.

Try this... plug into shore power but turn off the main breaker or the one to your converter. Start the furnace and pay attention to how fast the furnace fan runs on initial start up. (it will be running off the battery because you have the breaker thrown) While the fan is running, flip the breaker on so the converter is then providing the 12v. See if the furnace fan speeds up noticeably.
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Old 09-12-2016, 04:19 PM   #5
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Check the battery terminal connections. If they are not clean you can get a voltage drop. Also I am a little puzzled by your readings. A fully charged 12V battery should read 12.6V at rest. Check the voltage at the furnace with the conveter on and then when on battery only.
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Old 09-13-2016, 02:54 PM   #6
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Originally Posted by 5picker View Post
Try this... plug into shore power but turn off the main breaker or the one to your converter. Start the furnace and pay attention to how fast the furnace fan runs on initial start up. (it will be running off the battery because you have the breaker thrown) While the fan is running, flip the breaker on so the converter is then providing the 12v. See if the furnace fan speeds up noticeably.
Nice test. It could work for anything 12V. Thanks, I'll remember this one.
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Old 09-13-2016, 03:25 PM   #7
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Nice test. It could work for anything 12V. Thanks, I'll remember this one.
And it does work. I actually do it on everything before each outing. I fire up all the 12V stuff on battery alone, turn on the converter, then disconnect the batteries. Makes sure both 12V sources are working with a good load on them.
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Old 09-13-2016, 11:17 PM   #8
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Don't know how old things are...but if not new...could possibly B a worn out propane sniffer causing the gas to shut down at the solenoid. The other suggestions are more likely...but worth considering if nothing else works.
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Old 09-14-2016, 12:06 PM   #9
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Didn't Realize Furnace Could Run Off Battery Power

Quote:
Originally Posted by wmmccalljr View Post
My furnace works fine with I am plugged into 120V power source but when I am running on battery the fan comes on for a short time and then shuts off. My battery is new and fully charged and is at 13 volts so I don't think it is the battery. Could this be the sail switch?
That is a surprise to me the an RV furnace could even run off batter power. I thought it was like the air conditioners and had to have AC power. You would think that the fan would drain the battery quickly even if it was designed that way.

I may be wrong since I have not had the chance to read the manual on the furnace. I have a 2013 Georgetown.
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Old 09-14-2016, 12:26 PM   #10
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Originally Posted by hikerjohn7 View Post
You would think that the fan would drain the battery quickly even if it was designed that way.
It does drain the battery, sometimes in one night.
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