What shorted to ground means
The motor windings should be electrically isolated from the compressor shell.
When insulation fails, current can flow to ground and protective devices may trip.
Common symptoms
The breaker may trip immediately when the compressor is energized.
The compressor may not start, and electrical testing may show continuity from a terminal to the shell.
How it is confirmed
Power is isolated and compressor wires are disconnected. Each terminal is tested to ground with appropriate instruments.
External wiring, contactors, heaters, and other components must be ruled out.
Why it happens
Heat, acid, moisture, voltage stress, winding damage, and long-term wear can break down insulation.
Another system problem may have contributed to the failure.
What happens next
A truly grounded compressor generally requires compressor or system replacement.
The refrigerant circuit should be evaluated for contamination before repair.
Frequently asked questions
Can resetting the breaker fix it?
No.
Can a bad capacitor cause a grounded reading?
No, not an internal terminal-to-shell reading.
Should I keep trying it?
No.
Is replacement always the best choice?
Equipment age, warranty, refrigerant, and overall condition should be considered.
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