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When i turn the thermostat on outside AC unit comes on but inside blower motor does not.

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It needs to be checked. It could be a thermostat problem or it may be a bad blower motor or blower motor capacitor. Try turning your thermostat to the fan on position to see if the blower will start manually. If it does you most likley have a stat problem. If it does not start you will need to isolate the blower motor wiring and check to see that the motor has voltage. If it does then the blower motor is bad.then either the motor itself is bad, or the capacitor is bad. The capacitor is the cheapest thing to replace, so if you can't test it, then just go ahead and try that first. Also, make sure that there are no loose wires anywhere. --------- If you have a circuit board and no relays, then your blower is being controlled through a small relay that is part of the circuit board. You can trace the black/red wires from the blower motor to see where they connect - chances are they connect to a small black cube on the board. That is the relay. If you have access to an amp/volt meter you could check to see when the motor gets power from the board and how many amps it draws on start. This would be the easiest way to determine the cause. If you don't have access to a meter, you are kind of stuck either changing the motor or the board. Here is something you could try. Set the thermostat to OFF. Open up the air handler and disconnect the control wire that is connected to the G terminal on the thermostat (should be the green thermostat wire). Connect a jumper wire to the R terminal on the air handler. Touch the other end to the G terminal several time to see how the blower responds. You should hear a clicking on the circuit board as the relay responds. If everything seems to be responding properly, with the green wire still disconnected, set the thermostat fan switch to the ON position. Now take the green wire and touch it several times to the G terminal. If things do not respond as quickly and in the same manner as with the jumper from R, then there is a problem in your thermostat or control wiring. If things don't respond properly, this still doesn't tell you if the problem is the board or the motor, but at least you will have completely eliminated the thermostat and control wire.

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Posted on Jul 10, 2010


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