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softballjunky

palm desert california

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Posted: 01/14/20 10:49pm Link  |  Quote  |  Print  |  Notify Moderator

Hi all, I tried searching for my particular issue but couldn't see a post exactly like mine. 12 year old suburban furnace in travel trailer that will turn on and blow hot for about 5 minutes and then shut off before getting to set temp. I cannot get it to turn back on for a while, then after about 30 minutes it will run for a few minutes then shut off again. Where should I start? Any ideas would be great. Thanks in advance.


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garyemunson

Reno, Nevada

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Posted: 01/15/20 06:23am Link  |  Quote  |  Print  |  Notify Moderator

I'd suspect the high temp limit switch is failing and opening at too low a temperature.

rrupert

NW PA

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Posted: 01/15/20 08:44am Link  |  Quote  |  Print  |  Notify Moderator

garyemunson wrote:

I'd suspect the high temp limit switch is failing and opening at too low a temperature.


2X that, or you may have an obstruction in a heat duct or a closed register.


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opnspaces

San Diego Ca

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Posted: 01/15/20 10:23am Link  |  Quote  |  Print  |  Notify Moderator

Probably heat related. BryantRV has service manuals online for download. Just scroll down to the furnace section
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CavemanCharlie

Storden,MN

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Posted: 01/15/20 10:36am Link  |  Quote  |  Print  |  Notify Moderator

Wasps love building nests in the intake and exhaust ducts of these furnaces. I once removed a furnace and dumped a whole coffee can full of wasps nests out of it. Try looking down your intake and despicably the exhaust duct for nests and clean them out if you see any. It might be enough. If not you may have to remove the furnace to clean it.

softballjunky

palm desert california

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Posted: 01/15/20 11:28pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the information.

poppa

Dallas, TX

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Posted: 01/16/20 03:56pm Link  |  Quote  |  Print  |  Notify Moderator

im kinda new to tt's but am a resi ac guy. it mite be the heat anticipator on the thermostat. the other responses should be checked as well

CavemanCharlie

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Posted: 01/17/20 06:06pm Link  |  Quote  |  Print  |  Notify Moderator

poppa wrote:

im kinda new to tt's but am a resi ac guy. it mite be the heat anticipator on the thermostat. the other responses should be checked as well


Most TT thermostats are a simple mechanical unit. In fact many people replace them because they don't like them.

If he has replaced his thermostat you could be right.

softballjunky

palm desert california

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Posted: 01/18/20 12:07am Link  |  Quote  |  Print  |  Notify Moderator

Yes, it is the original that came with the trailer. I am sure there is no heat anticipator on it.

rrupert

NW PA

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Posted: 01/18/20 01:45pm Link  |  Quote  |  Print  |  Notify Moderator

softballjunky wrote:

Yes, it is the original that came with the trailer. I am sure there is no heat anticipator on it.


If it's an Attwood it probably has an anticipator. If you remove the cover you should be able to see a flat lever on the backplate. The ones I have owned the lever was moved all the way left which caused wide temperature swings. I moved the lever to about mid-point or 12 o'clock, and it evened out temperature swings. But I later replaced the old thermostat with an inexpensive Honeywell non-programmable digital thermostat. This made temperature management much easier.

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