I am not sure what is happening, We have two units the upstairs is running just fine. Now the downstairs keep blowing the fuse in the furnace. What it does is that it will let the fan run but when I reduce the temp. so the a/c will come on it blow the fuse.

Thanks,

George

You have a short in the 24 v (low voltage side) When you have a call for cool it blows. Check the 2 wires going from air handler to the condenser unit out side. Maybe a dog or weedeater got into them. Also could be the coil in the contactor in the outdoor unit has gone bad. If all this checks out OK need to check wires from thermostat to airhandler. Good Luck. Post back with results.