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Outside ac unit operates but no blower. Fan "on" does not operate from thermostat. However "heat" works fine furnace and blower. ???

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Go to furnace and shut off power, remove blower door compartment. Inside you will find a control board where thermostat wires are connected. Should look something like this:

R-Red Wire= Power
G-Green Wire= Fan
W-White Wire=Heat
Y=Yellow or Blue Wire=Cooling.

It sounds like you have a bad motor speed. So try this:

With Power Still Off, on the same control board there is a terminal usually marked Cool and Heat. There should also be a couple of terminals that are named park. The wires hooked to these are the fan wires..

Exchange the Heat and Cool wires on the terminal board. Put everything back together and try cooling again, if the fan comes on
then you have a burnt out motor speed. Go back to furnace and change
the heat and cool wires around, next if Cooling had the black wire hooked to it, put yellow or blue on Cooling and black to park.


Note: The reason why you put the blower door back on is because it
has a door switch that if not properly seated, you wont be able to power
up anything

Posted on Jul 15, 2010

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You need to check if the air handler fan running.Suppose if you donot see it then, check to see if the fan on the outside unit is running. If the fan on the outside unit is not running either, check to make sure that the breakers for the furnace/air handler and the air conditioner are on. Also if the breaker is not tripped, then the problem may be your thermostat, the furnace/air handler control board, or the wires between the furnace/air handler and the thermostat.

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