System won't turn off with thermosatat temp adjustment ( Goodman system)


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Old 07-28-08, 05:03 AM
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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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Old 07-28-08, 10:35 AM
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Edit -

Someone on another forums suggested to me that if is still runs when the green thermostat wire is removed then the control board is bad . ( which is the case ) .

I plan to order and change out the board with an aftermarket replacement type board which fits several models of Goodman furnaces ( ICM280 about $75 ) . Anyone familar with these .




Originally Posted by rkpatt
Furnace is a Goodman GMP-075-3 1998
A/C condensing unit is a Goodman 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 diagnose this further (and repair) ? - Thanks
 
 

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