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Old 04-01-2013, 07:25 AM   #1
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1985 29' Sovereign
Richmond , Virginia
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Furnace Question

Hi all...I've got an '84 Sovereign with the original furnace...have just recently started having an annoying problem, so thought I would see if anyone had any ideas.

Furnace starts up fine, blows hot air great, then after a bit just blows cold. If I turn the thermostat to off, wait for it to shut down, then turn it back on again it will start blowing hot again, for awhile (maybe 30-60 minutes), then blow cold.

So...waking up freezing every hour and having to restart the furnace is a bummer...and ideas?

Thanks!
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Old 04-01-2013, 07:52 AM   #2
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Originally Posted by Stonew98 View Post
Hi all...I've got an '84 Sovereign with the original furnace...have just recently started having an annoying problem, so thought I would see if anyone had any ideas.

Furnace starts up fine, blows hot air great, then after a bit just blows cold. If I turn the thermostat to off, wait for it to shut down, then turn it back on again it will start blowing hot again, for awhile (maybe 30-60 minutes), then blow cold.

So...waking up freezing every hour and having to restart the furnace is a bummer...and ideas?

Thanks!
Sounds like the circuit board has failed.

Andy
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Old 04-01-2013, 08:47 AM   #3
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Sounds like the circuit board has failed.

Andy
Thanks Andy...is that something I can repair (I'm sort of "well-trained monkey" type electrician), or is it time for a new heater?
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Old 04-01-2013, 09:29 AM   #4
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Sounds more like a limit switch (JMO), gets too hot and tells the board to shut the gas flow off. Most of the time if a board fails you won't get any heat at all. Notice I said most of the time. You can pull the furnace and take the board off ( easy only a couple of screws and disconnect a couple of wires) to an RV dealer and they can test it. The limit switch is easy to get to and only cost a few bucks to replace. The hardest part of the job is pulling the furnace.
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Old 04-01-2013, 11:41 AM   #5
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Thanks Andy...is that something I can repair (I'm sort of "well-trained monkey" type electrician), or is it time for a new heater?
I would suggest you do a bench test first.

Printed circuit boards are easy to replace, but they are not cheap.

Andy
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Old 04-04-2013, 03:15 PM   #6
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So this is odd...after going on and off like I mentioned earlier, it went to only blowing cold air...which made for a great night...don't buy a 20 degree sleeping bag from LL Bean, unless the air temp never gets below 60.

The tank selected was fairly full, but I switched to the other tank and it started blowing warm again...so I switched back over to the other tank again and that one is also blowing warm now.

Is it possible that there was some sort of pressure problem in the one tank that was causing the problem, and switching to the other made it work itself out? Or do I have a gremlin living in my belly pan that is periodically pinching off my gas line to mess with me?
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Old 04-04-2013, 04:32 PM   #7
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Originally Posted by Stonew98 View Post
So this is odd...after going on and off like I mentioned earlier, it went to only blowing cold air...which made for a great night...don't buy a 20 degree sleeping bag from LL Bean, unless the air temp never gets below 60.

The tank selected was fairly full, but I switched to the other tank and it started blowing warm again...so I switched back over to the other tank again and that one is also blowing warm now.

Is it possible that there was some sort of pressure problem in the one tank that was causing the problem, and switching to the other made it work itself out? Or do I have a gremlin living in my belly pan that is periodically pinching off my gas line to mess with me?
At this point an easy and fairly inexpensive thing to try is a new regulator. If all you did was switch over the regulator from one tank to the other and suddenly you had gas pressure to the furnace, that seems like an easy thing to try.
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