R-Pro › Field cases › Refrigeration systems
Compressor does not start
Likely causes
Power supply failure (circuit breaker trip, fuse blown)
Check: Measure supply voltage - confirm within ±10% of rated voltage
What to do: Measure supply voltage - confirm within ±10% of rated voltage → Check and reset circuit breaker / fuse → Manually reset overload relay and attempt restart → Measure start capacitor capacity (within ±5% of rated value) → Measure resistance between compressor terminals - check for open/ground fault → Resolve high-pressure trip cause (overcharge, condenser fouling) then reset
Overload relay activation (overcurrent)
Check: Check and reset circuit breaker / fuse
What to do: Check and reset circuit breaker / fuse → Manually reset overload relay and attempt restart → Measure start capacitor capacity (within ±5% of rated value) → Measure resistance between compressor terminals - check for open/ground fault → Resolve high-pressure trip cause (overcharge, condenser fouling) then reset
Defective start capacitor
Check: Manually reset overload relay and attempt restart
What to do: Manually reset overload relay and attempt restart → Measure start capacitor capacity (within ±5% of rated value) → Measure resistance between compressor terminals - check for open/ground fault → Resolve high-pressure trip cause (overcharge, condenser fouling) then reset
Internal compressor seizure
Check: Measure start capacitor capacity (within ±5% of rated value)
What to do: Measure start capacitor capacity (within ±5% of rated value) → Measure resistance between compressor terminals - check for open/ground fault → Resolve high-pressure trip cause (overcharge, condenser fouling) then reset
High pressure switch activation
Check: Measure resistance between compressor terminals - check for open/ground fault
What to do: Measure resistance between compressor terminals - check for open/ground fault → Resolve high-pressure trip cause (overcharge, condenser fouling) then reset
Repeated start failures risk winding overheat — allow cooling interval before retrying
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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