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Blower fan does not cutoff in gas mode after burner cuts off

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Hello, sometimes the fan relay will weld shut and cause the motor to run continuesly, in this case the the control board must be replaced since the relay is part of the board. Another possibillity is the thermostat wires shorting togethur between the G and and R terminal. Easy way to check is to unhook the G wire from the G terminal, if the blower stops there is a short, if it does not stop te relay is the problem

Posted on Nov 09, 2012

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