System won't turn off with thermosatat temp adjustment ( Goodman system) Furnace is a Goodman GMP-075-3 1998 A/C condensing unit is a Goodamn 2 ton 10 SEER unit 1998
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 (and repair) ? - Thanks
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