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Below is a logical thought pattern to solve some electrical problems with a air conditioning. It is not designed to cover all problems encountered but creates a path to enhance the thoughts to resolving the problem. This chart is for use by certified technicians only.
| Unit Running | |||||||||||||
| Yes | |||||||||||||
| No | |||||||||||||
| Go to Mechanical | |||||||||||||
| Thermostat Problem | checks | ||||||||||||
| Yes | No | ||||||||||||
| Repair & Recheck | |||||||||||||
| Voltage on compressor | |||||||||||||
| side of contactor | |||||||||||||
| Yes | No | ||||||||||||
| Run capacitor | Voltage on line side of contactor | ||||||||||||
| Start capacitor | |||||||||||||
| Potential relay | |||||||||||||
| Compressor internal overload open | No | Yes | |||||||||||
| Compressor winding open | Check breakers or fuses | Compressor contactor failure | |||||||||||
| Unit wiring connections loose | High pressure switch open | ||||||||||||
| or miswired | Yes | low presure switch open | |||||||||||
| Compressor time delay failed | |||||||||||||
| Compressor winding grounded | or not timed out yet | ||||||||||||
| Outdoor fan motor grounded | Miswired or loose connections | ||||||||||||
| Grounded capacitor | |||||||||||||
| Shorted line voltage wire | |||||||||||||
| Miswired | |||||||||||||
| Reset breaker or replace fuses | |||||||||||||