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Old 10-27-2013, 02:55 PM   #1
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Has anyone had trouble with their furnace. Ours just stopped working for no reason, plenty of propane, all three burners on the stove will light. no blown fuses, no changes in operating procedures, no blockage of vents inside or outside. This is the beginning of the second season of use. When I raise the temp setting on the thermostat it will operate the fan for exactly 30 seconds and then shutdown. It was working yesterday and today it is not.
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Old 10-27-2013, 04:08 PM   #2
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Take the thermostat off and jump the heat wires together- if it is wired like a house furnace these should be RED and WHITE - if it runs this way your thermostat is bad. Also could be a bad high limit ( don't know where or if its accessable) Good luck
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Old 10-27-2013, 04:51 PM   #3
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It could also be the gas valve or the igniter. When the thermostat calls for heat, the fan comes on to clear any combustion air from the combustion chamber, than the gas valve is supposed to open and the igniter spark to ignite the burner. It it doesn't ignite in a certain amount of time, it shuts down. You should be able to remove the outside cover, and check if the igniter is sparking and check the gas valve and make sure it is getting juice If not, it could be problems with the control board. . Also, if you haven't had it running recently, check to make sure your intake and exhaust is clear. Sometimes as little as a spider web can affect the furnace operation. Just some things to check, you may have to end up calling a service person.
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Old 10-27-2013, 06:47 PM   #4
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I want to thank you both for your help. I was digging into some of the other rv forums and happened upon a suggestion the was not mentioned anywhere in the repair manuals or even a logical direction that I would consider. On Outbackers.com a suggestion was made... When you trip a breaker while the heater is running you have to shut
down all the power from your 12 volt battery in order to reset the
emergency shut off valve on the heater..........OK...........we did trip a breaker.......I turned the battery disconnect to the off position and waited a few minutes and then turned it back to the on position. Went inside and turned the thermostat up and was surprised when the furnace started to blow out hot air. I am not sure how the 12 volt system is affected by tripping a breaker on the 110 volt side, I thought they were two separate systems, but the furnace is now working again.
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Old 10-27-2013, 08:16 PM   #5
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Another benefit to our group we all learn from each others problems. Glad to hear you have heat again.
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Old 10-27-2013, 10:02 PM   #6
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I heard about a couple in AZ that had to leave their RV for a couple of weeks and decided to leave the heat on due to cold night-time temperatures. While they were gone their RV Park had a brief power outage and when they returned to their RV the heat never came back on. All of their water lines froze and they had major water damage. I now wonder if their emergency shut-off valve was the culprit.
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Old 10-27-2013, 10:18 PM   #7
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More great information, got to love these forums, lots of good people
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Old 10-28-2013, 09:34 AM   #8
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I've been running the furnace in the Redwood as it's been cool here (with some snow ) and I don't want to winterize as we head south in a week or so. The batteries are completely disconnected from the trailer, I'm plugged into shore power and the 12V power is being supplied by the convertor. I had set the temp at 45 F to keep the pipes warm but to conserve propane. We had a series of short power failures due to the wet snow and when I went into the trailer to check the temp after the power failures the temperature was a toasty 72 F, looks like the thermostat resets itself to this default temperature after a complete power failure.
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Old 10-29-2013, 08:28 AM   #9
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Quote:
Originally Posted by almcc
I've been running the furnace in the Redwood as it's been cool here (with some snow ) and I don't want to winterize as we head south in a week or so. The batteries are completely disconnected from the trailer, I'm plugged into shore power and the 12V power is being supplied by the convertor. I had set the temp at 45 F to keep the pipes warm but to conserve propane. We had a series of short power failures due to the wet snow and when I went into the trailer to check the temp after the power failures the temperature was a toasty 72 F, looks like the thermostat resets itself to this default temperature after a complete power failure.
I would put the batteries back in your rig because if the power goes again the furnace will operate as if you were dry camping and keep everything at the temp that you had set it at. If the power goes out for a while you could freeze your pipes. Besides that your convertor is not designed to take that kind of load for very long which will end up in a replacement of the convertor at a hearty price.
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Old 10-29-2013, 09:30 AM   #10
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KR 2011, just for giggles I pulled out the document package received with my trailer and checked the specs on the furnace and on the PD convertor. The Suburban furnace is fused at 20 amps and the PD convertor can produce 100 amps at 13.6 volts. From this data it's clear that the convertor is designed to take much more load than the furnace is drawing. I also understand that some RV manufacturers run the units down the assembly line using the convertor to supply lighting to the trailer without batteries installed.

I do agree that keeping the batteries in the circuit will preserve the set temperature on the thermostat, but I do have a problem with keeping the batteries connected for an extended time when on shore power because of the boost charge from the convertor that comes on every 24 hours or so, and I learned that if you use the battery disconnect switch the batteries will completely discharge over time because the phantom electrical draws that bypass the disconnect switch, freezing and cracking the batteries then becomes a more severe problem.

Edited by: almcc
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