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Old 01-30-2018, 06:19 PM   #1
Wayne883
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Join Date: Nov 2015
Location: Mobile, Al
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Fuse for Thermostat

This may be well known by some here but was unknown by me until a few days ago. It got a little chilly down here in Mobile, Al so I decided to run my gas furnace in the Raptor one night. The next morning I noticed it was cold inside and the thermostat didn’t respond. No big deal, just another bug to chase down when time permits. A few days later I turn the AC on because it’s now hot in Mobile, and nothing happens. I notice I’ve got a blown fuse indicator in the power panel so I grab the fuse to remove it and the AC comes on. Apparently this is the low voltage supply for the thermostat. Turns out the fuse holder just needs tightening up to get the thermostat to work. I hope someone finds this useful because my first thought was to replace the thermostat, which was fine.


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Old 01-30-2018, 06:25 PM   #2
Wayne883
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And I forgot to mention, this fuse was also the source for the refrigerator control power. Thought that odd.


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Old 02-21-2018, 11:47 AM   #3
Old soldier
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Had problems with the furnace working in our 2018 Montana High Country 310re. Found Keystone used a 15 amp “self healing” fuze that over-heated and went into an “on/off/reset” cycle. Furnace cycled on/off/on/off uncontrollably. Replaced the fuze with a standard 15 amp fuze. Success for a while. But then we found the 12 volt fuze buss input was enlarged. Seems overheating by constant switching (and possibly too-light 14 gauge wire) made the input too loose to hold fuze securely. Moved fuze and its wire to an unoccupied spot which worked, but changing the entire panel to be safe. It might be only a 12 volt furnace fan, but it pulls a lot of power for its size. High draw can “warp” the fuze receptacle.


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Old 02-21-2018, 07:26 PM   #4
chuckster57
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Quote:
Originally Posted by Wayne883 View Post
And I forgot to mention, this fuse was also the source for the refrigerator control power. Thought that odd.


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You might be suprised (shocked) at how many different things can be one circuit. Usually the total amp draw of everything on that circuit doesn’t exceed the fuse rating. I have a tool that will plug into the fuse holder and as you turn things on it will show how many amps are being drawn.
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