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Old 09-15-2014, 11:02 PM   #1
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Furnace issue

Greetings, I am on an extended trip and didn't want to take time to research my issue but perhaps one of you could help me out. I have a 14 AI with the Dometic thermostat. This morning I cycled thru the modes on my thermostat to turn the furnace on which worked fine but the AC also came on. When I cycled the thermo to off, both turned off but each time I cycled thru to the furnace the AC would also come on. (the AC comes up in the cycle before the furnace does). Any ideas?
Thanks in advance.
Bill
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Old 09-15-2014, 11:29 PM   #2
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You might try turning the AC on and then adjusting the temperature on the thermostat way up to 90 degrees or something so that the AC will turn off or not cycle on at all. Then turn on the furnace.
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Old 09-15-2014, 11:32 PM   #3
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Originally Posted by c21bill View Post
Greetings, I am on an extended trip and didn't want to take time to research my issue but perhaps one of you could help me out. I have a 14 AI with the Dometic thermostat. This morning I cycled thru the modes on my thermostat to turn the furnace on which worked fine but the AC also came on. When I cycled the thermo to off, both turned off but each time I cycled thru to the furnace the AC would also come on. (the AC comes up in the cycle before the furnace does). Any ideas?
Thanks in advance.
Bill
The issue is with your fan setting. It's been several months since I have done any A/C work, but using the proper fan setting resolves the situation. Try setting the fan to 'HI' rather than 'AUTO' and that might do the trick. If not, do it the other way around. One will work for sure and will initiate the furnace only.

BTW, your A/C compressor is not on when both unite are on, just the blower. Dometic did this (this is from their tech support group) to help distribute the warm air from the furnace thru-out the trailer and keep the hot rising air at lower levels.
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Old 09-15-2014, 11:50 PM   #4
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Originally Posted by lewster View Post
The issue is with your fan setting. It's been several months since I have done any A/C work, but using the proper fan setting resolves the situation. Try setting the fan to 'HI' rather than 'AUTO' and that might do the trick. If not, do it the other way around. One will work for sure and will initiate the furnace only.

BTW, your A/C compressor is not on when both unite are on, just the blower. Dometic did this (this is from their tech support group) to help distribute the warm air from the furnace thru-out the trailer and keep the hot rising air at lower levels.

Thanks Lewster, I knew there would be someone out there with the answers.
Bill
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Old 09-16-2014, 04:57 PM   #5
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Mine does this too but the AC fan only runs for 30 seconds or so before shutting off.
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Old 09-16-2014, 05:20 PM   #6
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I have a AS travel trailer and I set the fan to AUTO when running the furnace. Otherwise the fan from the rooftop AC/HP unit (fan only not the AC) will come on when the furnace is on. Not sure if this is the same for Interstates but worth a try.

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Old 09-16-2014, 07:17 PM   #7
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I think this may have something to do with the fact that the Dometic thermostat can handle AC units with an optional heatstrip. The Interstate doesn't have that option, but turning the thermostat to heat may wake up the AC by turning on the fan. You may be able to turn off the fan by selecting a different setting for the fan such as "Auto" or "Slow", as Lewster pointed out previously.
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