Below are some common issues that could cause your compressor to not run:
The contactor should be energized or "closed" on a call for cooling. If the contactors contacts do not pull in or close (completing the high voltage circuit) voltage will not pass thru to the compressor. If the contactor has proper low voltage applied to the coil and it does not pull in, it is a bad contactor.
The compressor needs high voltage to start. The voltage must be within 10% of the manufactures recommended voltage for that compressor. Check for high voltage at all disconnects switches, fuses and breakers priory to the compressor.
Defective Low-Voltage Transformer:
Transformers will transform high voltage (460v, 230v 208v, 115v) to a lower voltage. Low voltage (typically 24-volts on
residential systems) to energize or "close" a contactor is supplied from a transformer. If this transformer is not working or
has less than 10% (21.6 volts) it will not be supplying enough voltage to pull in the contactor.
Questions? Give us a call: 239-596-5855!