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Old 09-07-2017, 09:20 PM   #1
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Furnace Not Working

We got our 2014 FR3 back in May. It has spent most of its time in the south so no need for the heater. It started to get cold, so when I turned it on the unit ran for 10 seconds then turned off. I have the fan on Auto and the Furnace is selected on the controller(green light beside furnace). The propane tank is about 1/4 and I have a 20 lb tank connected via the extended stay connector.

I turned the thermostat off for a couple minutes then back on and same thing furnace runs for 10 seconds then off with no hot air.

On another note, when I try to take off the furnace cover outside, there seems to be something sticking because with all the screws removed it won't separate from the exhaust ducts...

Any help would be greatly appreciated!
Thanks!
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Old 09-07-2017, 09:31 PM   #2
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If this is the first time you have run it, there may be air in the lines. If it does not light in a certain time, it shuts off, If this happens several times, it will go into safe mode and not start. If this happens, pull the fuse for the furnace for a minute or two then reinstall and try again. Also run the stove for a minute or two to bleed the lines to the stove.
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Old 09-07-2017, 10:12 PM   #3
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The stove and oven work fine. When we got it from the dealer they showed us it worked, but the furnace has not run since then. I have read that there should be a clicking sound trying to ignite the burner... but I don't hear anything. UPDATE: the blower turns on for 30 seconds then shuts off.
I checked the batteries and got the following numbers: Click image for larger version

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The red one seems off... also I thought the batteries are usually 2 6v batteries in series, I think I have 2 12v in parallel.
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Old 09-07-2017, 10:24 PM   #4
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Others here with more experience than I might be able to help but if battery voltage is not high enough it will exhibit those symptoms.

Edit: Sorry the photo didn't show up on my browser before I posted the above.
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Old 09-07-2017, 10:43 PM   #5
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If you're boondocking (no shore power) and running strictly on the batteries, if the batteries are NOT up to snuff, the blower fan will pull the voltage way down. The furnace will not light if the voltage is too low.

Try measuring the voltage at the furnace with the blower running. I suspect it's low.
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Old 09-07-2017, 10:47 PM   #6
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I will try that. We are currently hooked up to shore power 30A with nothing running on top of the standard items.
I also need to figure out how to get the outer furnace panel off. Last time I tried to open it, I removed all the screws and it seemed to be stuck on something. I was pulling pretty hard and it didn't budge. I even used a long screw driver for leverage but no luck
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Old 09-08-2017, 02:20 PM   #7
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Been a while, but when I last removed it, I think there was 4 screws and one of the outlets/inlets slides onto the tube that is hard mounted on the inside. So you can't pull up or down to remove the cover, it has slide off outward towards you.

Misspoke about parallel wiring. + to +, - to - as A32 Duece mentioned.

And I'd have a closer look at that LH battery after you put it on the charger and take a resting voltage reading. Looks like it might be toast if its truly at 11.6v.

https://www.energymatters.com.au/com...age-discharge/
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Old 09-08-2017, 02:53 PM   #8
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The batteries are 12v batteries....the model number is 27MDP which lists as a 12v. All of the other 12v items work, but I will try disconnecting and testing them. When I checked the voltage I did make sure the coach was disconnected from the shore line so it wasn't reading the charger voltage.
When you get a chance would you send me pics of how your batteries are wired? I thought most coaches where wired with 2 6v deep cell batteries...
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Old 09-08-2017, 03:24 PM   #9
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They are wired correctly. Plus to plus and minus to minus. Disconnect the one battery then check both batterys one at a time. Going from one battery plus side to another battery minus side can throw your reading off.
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Old 09-08-2017, 03:45 PM   #10
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I misspoke. Should be + to +. When I think about my setup, I have one swapped backwards, so my + to + is diagonal from each other. Sorry about the confusion. Check out your left hand battery though.
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