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Old 02-09-2019, 09:46 AM   #1
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Furnace does not shut off

The only way to shut off furnace is to pull the fuse. Blower and furnace stays running and heating. I have replaced the thermostat but still won’t shut off. What else should I check. Any suggestions would be greatly appreciated.
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Old 02-09-2019, 09:55 AM   #2
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High limit is bad.
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Old 02-09-2019, 10:05 AM   #3
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Thanks I’ll try that first.
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Old 02-09-2019, 12:38 PM   #4
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I would check the wires between the thermostat and furnace. If you have a short in this wire, the furnace will see it as the thermostat being closed and needing heat.
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Old 02-09-2019, 01:19 PM   #5
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Quote:
Originally Posted by Toddupton View Post
High limit is bad.
high limit won't cause his issues
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Old 02-09-2019, 01:20 PM   #6
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Originally Posted by BarabooBob View Post
I would check the wires between the thermostat and furnace. If you have a short in this wire, the furnace will see it as the thermostat being closed and needing heat.
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Old 02-09-2019, 02:14 PM   #7
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A bad high limit will make the blower run non stop.
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Old 02-09-2019, 02:59 PM   #8
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How long?

Quote:
Originally Posted by Bigdog6 View Post
The only way to shut off furnace is to pull the fuse. Blower and furnace stays running and heating. I have replaced the thermostat but still won’t shut off. What else should I check. Any suggestions would be greatly appreciated.
How long are you waiting for it to stop? The Suburban furnace control board immediately shuts the gas off when the thermostat is satisfied or you move the switch to OFF, but the blower will continue to run for two minutes. This serves two purposes:
  1. One blower scavenges the last heat from the furnace and uses it to heat the trailer.
  2. The other blower purges any unburned propane from the firebox so you don't get a POP when it ignites the next time.

You can't hear the propane shut off, but you certainly can hear the blower. I wonder if you are not waiting long enough.

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Old 02-09-2019, 03:09 PM   #9
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Originally Posted by MR.M View Post
high limit won't cause his issues
True

A defective high limit switch would not cause the burners to stay on, it would keep the fan running continuously after the burners have shut down.
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Old 02-09-2019, 03:20 PM   #10
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I had same problem on my Sabre. There furnace thermostat control wires pass through a control box in my ceiling AC. They were both stripped way back where they were connected to a terminal strip. Over time and vibration they engaged each other
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