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My blower flutters off and on when it is close to the time for the auto shut off. This problem does not seem to happen much during the daylight hours. I have changed the thermostat, and checked the wire connections. What is next, the circuit board? Model GMP075-4 This is with the A/C running

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Unfortunately the circuit board is the next part on the list to change as the relay that controls the blower is integral to the board. Before changing you need to verify that the relay ?board is the problem, this can be acomplished by using an ammeter on the common of the fan circuit, the amperage should reamin fairly constant during the entire run cycle, listen for "clicks" coming from the board during the last part of the run cycle as you described this issue when the unit is about to shut off. hope this helps...(the relay is a small black square on the GMC board, there are usually two side by side on the board.)

Posted on Jul 28, 2009

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Posted on Jan 02, 2017

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