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Old 04-07-2018, 02:06 PM   #1
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Join Date: Apr 2018
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M.O.C. #21512
Furnace Won't Turn Off

Have 2015 3611RL was working on toilet plumbing and furnace turned on with heat will not turn off. Turned off thermostat still running on full heat had to remove fuse to turn off any ideas were to look.
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Old 04-09-2018, 03:56 PM   #2
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M.O.C. #13740
I would put the fuse back in, unless you waited for several minutes after turning off thermostat. I would pull the outside cover off the furnace to see if there is any visable signs of water intrusion on the circuit board if the furnace started to run as soon as the fuse was re-installed. Has all the earmarks of a control board failure. You could unplug the thermostat to make sure it hasn't bit the dust...but I would find that harder to believe as it only tells the electronics to start a firing sequence.
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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Old 04-11-2018, 06:14 AM   #3
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M.O.C. #13325
The furnace doesn't just stop right away. That's because there's still heat in the exchanger and it will keep blowing air through it until it cools off. Sometimes takes a bit, but should be off within 5 minutes.
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