THe Fan 50 Plus Control Board is A Replacement option for the following Models 37875,36716,232613,232614.. Note: Fan control boards should not be used in DuoTherm? 900 series furnaces that have the thermostat in the ground circuit. DuoTherm? furnaces can be rewired to move the thermostat from the ground side of the circuit to the positive side of the circuit so that the Fan control features of the Fan control or FAN 50 Plus Pins board can be used.





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