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Old 02-10-2019, 07:32 AM   #1
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Join Date: Dec 2018
Location: Hillsborough
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Furnace and AC operating at same time

First trip with our 2019 27RB. Have not needed to use furnace until this morning. Outside temp of 35 degrees. Using our Dometic thermostat we set the mode to "furnace" and set temp to 67 degrees. Immediately the AC kicked on and started blowing cold air. A few seconds later the furnace started blowing warm air through floor registers. This continued until we turned off the thermostat. Tried it a few more times with same results. Suggestions? Ideas?
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Old 02-10-2019, 08:39 AM   #2
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Our thermostat has a setting for the fan of either "auto" or "on". If we run the furnace with it in the "on" position, the AC fan only will run along with the furnace. Putting he control between auto and on or leaving it in auto prevents the AC fan from running with the furnace on. Our thermostat is a Coleman digital, don't know if yours work like it, but that's the only way the AC fan runs without it set to "cool" for us.
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Old 02-10-2019, 01:51 PM   #3
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Originally Posted by LabMan View Post
Our thermostat has a setting for the fan of either "auto" or "on". If we run the furnace with it in the "on" position, the AC fan only will run along with the furnace. Putting he control between auto and on or leaving it in auto prevents the AC fan from running with the furnace on. Our thermostat is a Coleman digital, don't know if yours work like it, but that's the only way the AC fan runs without it set to "cool" for us.
What he said, turn the fan to auto.
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Old 02-10-2019, 03:06 PM   #4
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Location: Live Oak
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Originally Posted by Travelchief60 View Post
First trip with our 2019 27RB. Have not needed to use furnace until this morning. Outside temp of 35 degrees. Using our Dometic thermostat we set the mode to "furnace" and set temp to 67 degrees. Immediately the AC kicked on and started blowing cold air. A few seconds later the furnace started blowing warm air through floor registers. This continued until we turned off the thermostat. Tried it a few more times with same results. Suggestions? Ideas?
Need to calibrate your thermostat. I do that everytime since when you kill the batteries and pole power there's zero power to your trailer. Its like your thermostat is a new install every trip needs to be calibrated as such
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Old 02-11-2019, 07:16 AM   #5
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Thanks for your guidance. Suggested resolutions proved successful.
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