The system will not run at all; what do you think is going on?

The most common reason that a system will not run is because of a loss of power.  In most every situation an air conditioning system is protected electrically be a breaker or fuse, which is located somewhere in the power supply lines upstream from both the air handler and condenser units. Find this breaker, turn it completely off, even if it appears to be off, then turn it back on again. If it trips again, leave it alone and call your contractor. The second most common reason for a system not to respond is problems in the control circuit – usually the thermostat connections or the transformer.

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