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View Full Version : Blower works on heat butnot a/c

jbox1973
Jun 23, 2009, 07:54 PM
On my central unit the heat works fine but turn on the a/c the blower motor won't come on. I replaced the relay.
hvac1000
Jun 24, 2009, 03:41 AM
It could be the

Thermostat
Thermostat low voltage wiring
Defective circuit board if one is used in the system

These three will be a good start.