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Old 03-04-2009, 02:58 PM   #1
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We rarely use our propane heater, but have noticed that when the coach is really cold and the heater needs to run for awhile, it cycles. If I set the temp at 70 degrees the fan will run until 70 degrees is achieved, but the propane burner will cycle on and off several times.

My question is......is this normal, or should the burner continue to run until the temp is reached. I realize it's cycling because the heater box is getting too hot, but should it be getting that hot. I've checked the box and there is plenty of open air space and no obstructions. I'm hoping this is normal and may be caused by the size of the heating unit.

Has anyone noticed theirs cycling like this?
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Old 03-04-2009, 03:39 PM   #2
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Don,
Mine does the exact same thing...the furnace cycles on and off. I think you are correct that it shuts off at a certain temp then cycles back on after a short cool down.

Steve
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Old 03-04-2009, 03:44 PM   #3
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Perfectly Normal Don

The thermostat is a bit too sensitive for its own good so it cycles...if I run the ceiling fan in the bedroom it stays on all the time thinking that it is too cold.
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Old 03-04-2009, 04:22 PM   #4
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Another thing that could cause this is the bonnet overtemp sensor. If there is not enough air flowing over the bonnet, or if the sensor is a wee bit too sensitive, it will cause an identical scenario.
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Old 03-14-2009, 09:00 PM   #5
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The short cycling has several causes. One that is often overlooked is that people tend to shut down some vents in order to force more warm air to a colder part of the rig. This restricts air flow. The second most overlooked is to check the intake at the furnace to be sure it has lots of free air flow. No dirt, dust, pet hair or other debris clogging the air flow. You might also wish to check your burner tube for obstructions. Things like mud daubers love to build nests in rarely used furnaces. Your eco high temp t-stat is shutting off the gas. It should not do that. Your furnace should run until it reaches temp. At least that is my understanding.
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Old 03-14-2009, 09:25 PM   #6
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More than likely it is cycling on the high limit switch due to low air flow. make sure all of the vents are wide open and none of the dusts are crushed.

Another problem can be if a vent is blowing toward the thermostat. This will sense a satisfied temp, cycle the burner and before it cools down for shut off, the thermstat will remake and bring the burner back on.

And it could be a faulty high limit switch.

Ken
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Old 03-15-2009, 07:24 AM   #7
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Quote:
Originally Posted by TXiceman View Post
.......
Another problem can be if a vent is blowing toward the thermostat. This will sense a satisfied temp, cycle the burner and before it cools down for shut off, the thermstat will remake and bring the burner back on.
.........
Ken
On a different unit that we owned this was the exact problem. The rig was brand new and from the get go the furnace would come on and run for about 1 minute and then the flame would go out and the fan would run as normal to cool down the fire box. Then since the coach was not actually warm the furnace would start the cycle over again. Since the unit was new we took it back to the dealer and they replaced the thermostat. This did not solve the problem and the cycling was the same. I decided I would have to fix it myself. After looking at things for awhile I realized that one of the registers was pointed right at the bottom of the thermostat. I closed off that register and the problem was solved. I sent the manufacturer a letter and noticed that the next year they had moved that register.

Bob
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Old 03-15-2009, 09:38 PM   #8
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Don,

I had the short cycling on my front zone. Had it looked at last fall by the dealer where I'm storing MH for the winter so I haven't had the chance to check there fix yet. Anyway if you have more than one zone it's possible the problem is with the remote temperature sensor. Could be a vent pointed directly at it, the easy fix, or a wiring problem which could be involved.
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