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Old 09-13-2018, 08:40 PM   #1
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Furnace running while AC IS ON???? The

Relaxing at the campground tonight with the AC ON LOW COOL and all of a sudden the furnace comes on? The thermostat is in the off position and the temperature setting is at its lowest.
Canít figure out whatís going on. Anybody got any ideas?

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Atwood furnace.
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Old 09-14-2018, 05:28 AM   #2
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Hank, what kind of thermostat do you have? Can you send a pic of it?

Also, the AC is running while the thermostat is in the off position? Is the AC controlled by the same thermostat as the heater?
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Old 09-14-2018, 07:58 AM   #3
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Could it have been the water heater firing up?
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Old 09-14-2018, 09:21 AM   #4
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We have Coleman t stat easy to brush it with your arm in the hall. Have actually push to on position not even noticing!
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Old 09-14-2018, 10:48 AM   #5
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So looking at this on the Jayco site, it appears to have split AC/Heat (separate systems) with the standard mercury switch T-stat for the heat (evident in the current year pictures). That generally indicates non-ducted A/C with ceiling discharge only.

When you say the heat is off, is the switch off (my experience with these is that the on/off switch is VERY stiff and hard to move), or are you just turning it "all the way down"? Note that full down is not actually that cold, so if the AC got it cool enough, it would call for heat.

Have you changed out the original T-stat for a better one? Some residential T-stats have a minimum temp setting and will call for heat below a certain setting regardless of switch to prevent pipe freezing - off on these is more like a vacation setting.

Was it getting fairly cold in the TT when the heat kicked in? Low cool can still get the unit pretty darn cold, it just takes longer to get there than hi cool.
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Old 09-14-2018, 11:36 AM   #6
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Old 09-14-2018, 07:44 PM   #7
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Problem solved

Problem solved. I had the furnace serviced just prior to this trip and though it looked like it was off, when I removed the cover it was obvious it wasn’t. The switch is very stiff. It was coming on because we had it pretty cool after a hot day of crabbing and fishing.
Thanks to bankr63 and everyone for your responses. Great group of people.
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Old 09-14-2018, 09:09 PM   #8
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Quote:
Originally Posted by Hank Hill View Post
Problem solved. I had the furnace serviced just prior to this trip and though it looked like it was off, when I removed the cover it was obvious it wasnít. The switch is very stiff. It was coming on because we had it pretty cool after a hot day of crabbing and fishing.
Thanks to bankr63 and everyone for your responses. Great group of people.
Hank, thanks for your feedback! Glad to hear you have it sorted.
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