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Old 07-07-2014, 10:11 PM   #11
Junior Member
Join Date: Dec 2012
Posts: 13
I had the same problem. For some reason the wires that go to the AC unit are not connected or an open in the lines is present. I had to install a separate thermostat to the fan control wires to get it to work. FR was not help and I had to troubleshoot it myself...Im an electrical engineer.

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Old 07-08-2014, 04:56 AM   #12
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Join Date: Dec 2011
Location: Collinsville, IL
Posts: 830
Here is an explanation that I posted several months ago:

On your thermostat, the setting marked fan determines whether the fan on the air conditioning unit will run all the time, or cycle on and off with the air conditioner. However, when you are running the furnace, the setting will determine if the fan (air conditioning fan) will run when the furnace is on.

Move the thermostat to the "fan" position and you will see Hi, Lo, or AU (for automatic). Use the + and - key to change settings. Then move thermostat to Air Conditioning or Furnace, as desired (or Heat Pump if you have that option.) Here's how the fan setting will work:

When the furnace is on, the fan setting of AU (auto) will keep the air conditioning fan off at all times. (That's the air circulating through the upper air vents (ceiling). Only the furnace fan will cycle on and off as needed (lower air vents that blow hot air). If the fan is set to Hi or Lo, then whenever the furnace and its fan come on, the air conditioning fan will also run on hi or low speed. Hot air will come from the lower vents directly out of the furnace. Cooler (room temperature) air will circulate from the upper vents.

When the air conditioning is on, it works a little differently. In the auto position, the fan will come on only when air conditioning is needed. It will switch from high to low as needed to meet the demands of the thermostat. With air conditioning selected and the fan on hi or low, the fan will run continuously at the selected speed and the air conditioning compressor will cycle on and off as needed to cool the MH. (A continuous running fan can be helpful in blocking out sounds of noisy neighbors).

If you have the optional heat pump, the fan control will work like it does for air conditioning. Heated, but not "hot" air will come out the upper vents.

Air conditioning (and its fan--upper air vents) require 120v power, so you must have shore power or generator running. Furnace requires propane and 12v power, so propane must be on and battery disconnect on. The furnace will use a lot of battery power if it runs much, so batteries will need to be charged often (every day or every other day).

2012 Forest River Sunseeker 2300 Chevy

2012 Forest River Sunseeker 2300 Chevy
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2014, fan, furnace, sunseeker

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