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09-12-2016, 08:30 AM
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#1
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Junior Member
Join Date: Sep 2016
Posts: 2
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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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09-12-2016, 08:38 AM
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#2
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,152
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Have you checked the battery voltage at the furnace?
__________________
2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2024 Ford F-Series SCREW•7.3L•4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
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09-12-2016, 08:49 AM
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#3
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Junior Member
Join Date: Sep 2016
Posts: 2
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Quote:
Originally Posted by 5picker
Have you checked the battery voltage at the furnace?
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No, I did not check the voltage at the furnace.
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09-12-2016, 03:08 PM
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#4
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,152
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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.
__________________
2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2024 Ford F-Series SCREW•7.3L•4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=118 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=118☼ '24=90
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09-12-2016, 03:19 PM
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#5
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Site Team
Join Date: Oct 2014
Posts: 15,302
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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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2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
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Honda 2000I + Companion
2 100W solar panels
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09-13-2016, 01:54 PM
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#6
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AKA: 'tiredTeacher
Join Date: Jan 2013
Location: Richmond, Virginia
Posts: 1,045
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Quote:
Originally Posted by 5picker
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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Nice test. It could work for anything 12V. Thanks, I'll remember this one.
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Wright and Penny
(with Fitz and Lizzie, the camping kitties)
Richmond, Va.
2010 Tundra 4X4 5.7L V8
2014 Rockwood 2604WS
Life is a cruel teacher. She gives the test first; the lesson then follows.
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09-13-2016, 02:25 PM
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#7
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Senior Member
Join Date: Jun 2013
Location: Brazoria County, Texas
Posts: 1,460
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Quote:
Originally Posted by awellis3
Nice test. It could work for anything 12V. Thanks, I'll remember this one.
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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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2015 Chevy Silverado LTZ - HD tow package
2017 Rockwood 2703WS Emerald Edition
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09-13-2016, 10:17 PM
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#8
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Senior Member
Join Date: Feb 2014
Posts: 2,832
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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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Cam
2015 Georgetown 280DS
2019 Vespa Primavera 150's (pair)
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09-14-2016, 11:06 AM
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#9
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Senior Member
Join Date: Jan 2014
Location: Palm City, FL
Posts: 298
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Didn't Realize Furnace Could Run Off Battery Power
Quote:
Originally Posted by wmmccalljr
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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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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09-14-2016, 11:26 AM
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#10
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AKA: 'tiredTeacher
Join Date: Jan 2013
Location: Richmond, Virginia
Posts: 1,045
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Quote:
Originally Posted by hikerjohn7
You would think that the fan would drain the battery quickly even if it was designed that way.
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It does drain the battery, sometimes in one night.
__________________
Wright and Penny
(with Fitz and Lizzie, the camping kitties)
Richmond, Va.
2010 Tundra 4X4 5.7L V8
2014 Rockwood 2604WS
Life is a cruel teacher. She gives the test first; the lesson then follows.
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09-14-2016, 12:17 PM
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#11
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Site Team
Join Date: Jan 2007
Location: Goodyear, Arizona
Posts: 33,858
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Quote:
Originally Posted by hikerjohn7
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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Your furnace is run and ignited by 12v DC battery power.
Shore power simply recharges the battery through the converter.
__________________
Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.) 
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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09-14-2016, 03:10 PM
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#12
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Senior Member
Join Date: Jan 2014
Location: Palm City, FL
Posts: 298
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Good To Know
Quote:
Originally Posted by bikendan
Your furnace is run and ignited by 12v DC battery power.
Shore power simply recharges the battery through the converter.
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Thanks for the reply. I guess it's good to know in case you are isolated on a cold night where you didn't want to run to auxiliary.
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