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Old 04-08-2015, 07:55 PM   #1
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Join Date: Apr 2015
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Furnace Issue

Hi everyone,
i have a 2011 Open Range and I'm seeing something strange with the furnace fan. It won't turn off. The thermostat is set to OFF but the fan keeps going until the battery dies.

As soon as I apply power (such as hooking it up to my truck) it starts up again.

Any ideas?

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Old 04-09-2015, 08:22 AM   #2
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Join Date: Apr 2011
Location: Powell River, B.C.
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The signal from the thermostat goes to an electronic control board, and on the board is a relay that controls the run cycle of the fan. Most furnaces the board is visible with the outside cover removed. Disconnect the RV battery , and remove the board and take to an RV parts store , most are capable of bench testing the board to confirm a fault.
If you don't have an owners manual for your furnace, the manuals are available from the manufacturers web site as a free pdf download.

99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 04-11-2015, 04:51 AM   #3
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On my thermostat there is an option to have the fan on all the time, its labeled low or high.

when you set it to auto it will shut off after the chamber cools and and come on a few seconds before the chamber fires for heat or the same for AC with the compressor.

look for the auto setting....
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ace, furnace

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