Lennox air conditioner unit turns on inside but the fan will not run outside and no noise from unit?

Question

Just bought this house. Air conditioning unit was not tested during inspection due to the temp outside. First time using it and we have problems. Air conditioner turns on just fine inside the house - no cool air. Outside unit shows the fan not turning on - tried manually turning to get it going...nada. No sound coming from the motor at all. Slight humming sound coming from the contactor? Any ideas? Possibly a bad motor?

Answer 1

check breaker to outside unit. Also disconnect by unit. Than is all you can do unless you have some tools

Answer 2

First you have to figure out is there power. Could be bad contactor bugs like to get in them.

Answer 3

What I have found is some folks think they are saving money by turning of the power to the outside unit for the winter. Not a good idea. Check the breakers first to be sure they are on. Next, there should be an electrical box near the outside unit. It either has a switch or fuse block that can be turned upside down to turn the unit off.



If you fine that this is true, turn off you cooling at you thermostat and turn the power back on to the unit. DO NOT RUN IT FOR 24 HOURS to let the compressor warm up to prevent damage.



Leave the power on all year. This will keep your crank case heater warm and help save your compressor.

Answer 4

exterior fan motor and compressor are separate. if both are not working and 220v feed tests good, there's a magnetic relay inside under the cover panel that may be the problem -- it usually black and the size of a big matchbox. there's a rectangular button in center ... press button in to test system. if it starts when you do this but doesn't activate on its own, then either the relay or the wiring or the thermostat is not working properly.



could be as simple as the cool signal line is disconnected at back of thermostat. or that it's disconnected at the circuit board on the outside unit. can be tested with voltmeter [should be 24v ac in usual US application]. could be the relay has failed, too.



beyond that, you probably need a repairman