R-Pro › Field cases › Refrigeration systems
Power Supply Fault
Likely causes
Circuit breaker tripped or not switched on
Check: Confirm circuit breaker is in ON position
What to do: Confirm circuit breaker is in ON position → Measure wiring continuity to compressor (multimeter) → Inspect fuse or fuse holder → Check terminal tightness and contact quality → Re-close breaker and re-measure voltage
Broken or loose power wiring
Check: Measure wiring continuity to compressor (multimeter)
What to do: Measure wiring continuity to compressor (multimeter) → Inspect fuse or fuse holder → Check terminal tightness and contact quality → Re-close breaker and re-measure voltage
Blown power supply fuse
Check: Inspect fuse or fuse holder
What to do: Inspect fuse or fuse holder → Check terminal tightness and contact quality → Re-close breaker and re-measure voltage
No voltage at compressor terminals. Inspect the power circuit in order: breaker → fuse → wiring. Always de-energize and follow LOTO procedures before working on wiring.
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
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