My American Standard Air handler won't turn off

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Old 10-11-11, 10:18 AM
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My American Standard Air handler won't turn off

I have an American Standard Air handler off of a Trane Heat pump that will not turn off the model number is twh736b140a0. I'm thinking maybe a relay is bad, anyone know of a solution or replacement part. Thank You.
 
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Old 10-11-11, 03:35 PM
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by not shutting off do you mean that the fan continues to run? Is the thermostat fan switch on ON or AUTO?
 
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Old 10-11-11, 03:52 PM
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If the fan is on AUTO, then for kicks, remove the G wire at the stat. If the fan stops, then it may be the stat. If the fan stays on, then go to the air handler, and remove G there.. If that stops, then you have a short in the wire. if it don't stop, then it's the air handler itself.
 
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Old 10-12-11, 01:43 PM
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Looks like I found the problem, it was the delay time relay in the air handler. I replaced that and all is well
 
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