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A/C won't turn off regardless of thermostat setting ? GMP075-3 w/ 2 ton A/C

It is now the middle of a hot summer . The system is cooling fine but a problem has developed where the A/C and fan stays on regardless of the thermostat setting . I can only tun it off by placing the switch thermostat in the off position (between heat and cool ) . I suspect that is probably a bad control board or thermostat . How do i diagnosis this further ? - Thanks

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If you are able to shut the system down by using the thermostat as mentioned, the thermostat is either bad or the programming is messed up. Check the fan switch and turn it to "Auto".

Posted on Aug 07, 2008

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Posted on Jan 02, 2017

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