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Old 06-27-2008, 06:29 PM   #1
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1963 22' Safari
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Yakima Valley , Washington
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furnace on/off cycling

When we were out doing our shakedown trips we used the furnace a few times. It ran great when the trailer was much colder than the setting, but cycled pretty consistantly when it approached temp (fan on, light of flame, burn, fan only, off, maybe a minute and repeat). The unit was installed when we purchased the trailer and was the only new thing in the beast. It is an Atwood 7916 electronic ignition.

The thermostat however is original. I'm planning on replacing it with a new one tomorrow but finding accurate testing of it difficult with daytime temps reaching 104+ the next few days. Has anyone encountered this type of problem and do you think I'm on the right track? Our next trip is only a few days away and is more than just a couple nights so want to make sure we have it resolved before we go. Thanks!

Here's a link to a seller of the furnace (I don't know where they PO got it)
Hydro Flame Furnace - Hydroflame Furnace Parts

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Old 06-27-2008, 06:56 PM   #2
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1991 34' Excella
1963 26' Overlander
Central , Mississippi
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Ours did that when we were camping in the 20's and 30 degree range during our yellowstone trip. I suspected the deadband range of the thermostat was too narrow but like ya'll, it's in the 90"s so I have somehow forgotton about it...
In reality, some thermostats have adjustable deadbands that when set for, say 70 degrees, don't turn off the heat till an adjustable temp ABOVE that point, say 72 degrees. By widening that range the heater will stay off longer between cycles. The down side is... pull up the covers, heater comes on, kick off the covers, heater goes off...repeat all night long...
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