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Old 10-22-2011, 04:08 PM   #1
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Bryant Plus 09i won't shut off


My Bryant Plus 90i furnace continues to heat on high heat after reaching the set temperature. Replaced the thermostat - no effect. No fault codes. What do I look for?

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Old 10-22-2011, 04:30 PM   #2
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Bryant Plus 09i won't shut off


Are you saying that your house is getting too hot or that a 2 stage is only heating on the second stage?
If its the former..the 1st thing to look for is a short between the thermostat lines somewhere between the mother board and the thermostat on the wall. (worn insulation between both lines or over metal, maretts that are missing on a spliced connection, a nail or staple through both of them, etc.)

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Old 10-22-2011, 06:07 PM   #3
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Bryant Plus 09i won't shut off


Both stages work - it just keeps pumping out high heat after satisfying the thermostat. I'll check what wiring I can reach - most of it is buried in the walls. Thanks.
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Old 10-23-2011, 07:04 PM   #4
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Bryant Plus 09i won't shut off


I hooked up the thermostat to the furnace with a short wire. Same result - once it starts a heat cycle it won't stop. Turning the thermostat down below room temperature doesn't stop it. Setting the heat-off-cool switch to off doesn't stop it. Anyone have a troubleshooting manual?
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