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Old 01-19-2015, 07:42 PM   #1
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Suburban SF-35 Propane Furnace won't ignite

I'm stumped. I live full-time in Newmar 5th wheel. Pretty standard Suburban SF-35 propane furnace with (2) 30# propane bottles with auto change over regulator. I ran completely out of propane. Obviously no propane no heat. I filled bottles as usual, opened valve slowly and the furnace will now not light. I have gas at stove and at the hot water tank with no problems.
I have pulled the fuse and replaced it with one the works. I have switched tanks and verified it's not a tank issue. When I set the thermostat to "furnace" position and raise the temperature setting to call for heat I can hear a relay "click" sound and that is all. This furnace has worked well and has been run out of propane before. I removed the exterior cover and there is a 5 amp fuse that appears ok. I have 12.4 volts at the battery. Ideas??? Thanks
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Old 01-19-2015, 07:44 PM   #2
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Turn on all the stove burners to be sure the system is purged and try again.
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Old 01-19-2015, 08:00 PM   #3
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It's well purged at this point. It happened about a week ago. No problems with propane at stove or hot water tank. We are in Sarasota
Florida. Staying warm with electric heat!
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Old 01-19-2015, 08:29 PM   #4
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You said you have 12.4 volts at the battery have you checked the power at the furnace control board? Disconnect power to furnace for a few moments then reconnect may reset the control board.
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