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Old 11-13-2017, 10:09 AM   #1
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Heat Pump Fan Running w/ Furnace

Hey y'all we have a 12ft Flagstaff A Frame w/ a heat pump (heat & AC) and a traditional furnace. We really needed the furnace heat for the first time this past weekend and I noticed something odd.

When the furnace is operating it cycles on and off as needed to maintain the proper temp. However, the fan from the heat pump is running at all times and blowing cool(ish) air.

Is this operating properly?
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Old 11-13-2017, 10:12 AM   #2
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Your thermostat has a heat/cool/auto setting as well as a Fan Hi/Lo/Auto setting. Make sure the Fan setting is set to Auto. On Hi or Low the the fan will run whenever the furnace is running. The idea is it helps circulate the air.
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Old 11-13-2017, 10:16 AM   #3
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Many thanks!
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Old 11-13-2017, 03:41 PM   #4
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No thats not right, this is what happens when non a framers answer. The domestic tstat is designed to only allow the a/c-heat pump or the furnace to run by themselves. If I run my propane furnace the a/c-heat pump is not running the fan, something is messed up with your wiring at the tstat.
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Old 11-13-2017, 04:06 PM   #5
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Originally Posted by sundancer330 View Post
No thats not right, this is what happens when non a framers answer. The domestic tstat is designed to only allow the a/c-heat pump or the furnace to run by themselves. If I run my propane furnace the a/c-heat pump is not running the fan, something is messed up with your wiring at the tstat.
Well there must be a lot of "messed up" tstats out there as that is exactly what mine does as well as 1 of my friends who owns the same unit.
Put the fan on auto and it magically shuts off.
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Old 11-13-2017, 04:07 PM   #6
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kkjellquist, what is the make, year and model number for your A-frame and a/c heat pump along with the furnace. Do you have the owners manual and other documents that came with the a-frame. If you get the make and model numbers you can get the necessary documents online.
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Old 11-13-2017, 04:22 PM   #7
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Quote:
Originally Posted by T11ravis View Post
Well there must be a lot of "messed up" tstats out there as that is exactly what mine does as well as 1 of my friends who owns the same unit.
Put the fan on auto and it magically shuts off.
A regular tstat yes it will work that way. The Dometic led tstat only allows it to be in one setting at a time, you can't turn on the furnace and the heat pump-a/c fan together. Here is what it looks like. Once again the non aframers don't have any idea whats in these units.
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Old 11-13-2017, 04:31 PM   #8
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Quote:
Originally Posted by sundancer330 View Post
A regular tstat yes it will work that way. The Dometic led tstat only allows it to be in one setting at a time, you can't turn on the furnace and the heat pump-a/c fan together. Here is what it looks like. Once again the non aframers don't have any idea whats in these units.
I'm almost willing to bet a Reese's Pieces that if you click the Mode button on the pictured thermostat until the FAN light comes on, you can click the + or - button, you can cycle through FAN settings of HI, LO, and AU (for Auto). The AU setting on my almost exactly same (except for color) DOMETIC thermostat will prevent the fan from running while the furnace is on.
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Old 11-13-2017, 04:33 PM   #9
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kkjellquist & sundancer330

There has been several threads on that thermostat. If I recall, it does have a auto setting for the fan and you have to use the On/Off Mode button in combination with the +/- buttons.

The latest thread was yesterday if I remember right.

edit: X2 what Mr. Dan said.
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Old 11-13-2017, 04:42 PM   #10
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https://www.manualslib.com/manual/72...c-3313192.html
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