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Old 01-04-2016, 09:11 AM   #11
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This is a picture of the wiring behind the furnace with the jump wire he added
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Old 01-04-2016, 10:38 AM   #12
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Join Date: Mar 2008
Location: Southwest Alabama
Posts: 3,283
The furnace wires are;
Red = +12V
Yel = -12V
The Blues are to and from the T-stat.
One of the Blues is hooked to +12V through the valve switch.

You can test the T-stat by unhooking the blue wires and checking continuity through them. They should be shorted when the stat calls for heat and open when it isn't calling for heat.

If that checks out, check what happens if you leave the red and yellow wires hooked up and disconnect the blue wires. The unit shouldn't run. If it does then I suspect the internal hookup of the blue wires is wrong.

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Old 01-04-2016, 11:02 AM   #13
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Check the blue with white tape-green-small red and the blue-small white. You might have the small red and small white mixed up.

Which is "the jump wire he added"?

Check the wiring per page 31 of the service manual below.

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Old 01-04-2016, 11:35 AM   #14
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Join Date: Jan 2015
Location: West Michigan
Posts: 278
Originally Posted by cabinmo View Post
This is a picture of the wiring behind the furnace with the jump wire he added
Hi at the furnace disconnect the white wire from the blue wire furnace should stops. If it dose reconnect white and blue wire at furnace then remove thermostat from wall and disconnect the white wire from the thermostat furnace should stop. If it dose then thermostat has failed and needs to be replaced. If it don't the cable with the red and white wire with the brown jacket to the thermostat has shorted at some point. If this has happened I would look for the damaged part in the furnace compartment. It dose not take much to pinch the wires together damaging the wire insulation and shorting them.

hope this helps Tim

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furnace, suburban

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