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Old 08-15-2012, 12:09 PM   #1
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Lennox air conditioner


I have a Lennox ELITE series XP16-24-230-04 heat pump, CBX27UH-030-230-6-02 Air Handler and a Honeywell Vision PRO TH8000 thermostat.
The problem is that at various time the units will go into a heat mode (uncontrolled) when the thermstat is set for cooling.
I have been able (sometimes) to get back to into a cooling mode by operation of the circuit breaker thus probably reseting the units. At present this operation has not been successful.
Can you provide me some guidance?
Thanks,
Billy

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Old 08-15-2012, 01:01 PM   #2
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Lennox air conditioner


Next time it happens use your meter and check between o and c at the heat pump. There should be 24 v there with a cooling call. If that's good the check between w and c at the air handler and at the heat pump to see where the heating call is coming from.

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Old 08-15-2012, 05:52 PM   #3
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Lennox air conditioner


Good chance it has a bad defrost stat.
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