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My Honeywell T87F Thermostat doesn't shut the A/C off when the temp in the room gets down to the Thermostat setting. I have it set on COOL and AUTO. I have to shut the A/C off; then later turn it back on as it gets warmer again.

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Remove the thermostat and disconnect the r and y connection. If the A/C continues to run ya got a short in the wiring somewhere. If it shuts down then your tstat is hooped.

Posted on Jun 10, 2008

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