R-Pro › Field cases › Refrigeration systems
Thermal Overload Protector Tripped
Likely causes
Excessive current (refrigerant overcharge, high condensing pressure)
Check: Measure compressor surface temperature (overheating if ≥90°C)
What to do: Measure compressor surface temperature (overheating if ≥90°C) → Measure supply voltage (within ±10% of rated) → Compare operating current with rated current → Check condenser fan and cleanliness → Wait 15–30 minutes for cooling and auto-reset → After reset, eliminate root cause
Compressor overheating from poor ventilation
Check: Measure supply voltage (within ±10% of rated)
What to do: Measure supply voltage (within ±10% of rated) → Compare operating current with rated current → Check condenser fan and cleanliness → Wait 15–30 minutes for cooling and auto-reset → After reset, eliminate root cause
Voltage imbalance or undervoltage
Check: Compare operating current with rated current
What to do: Compare operating current with rated current → Check condenser fan and cleanliness → Wait 15–30 minutes for cooling and auto-reset → After reset, eliminate root cause
The thermal overload protector has tripped. Allow cooling and auto-reset, then identify and eliminate the root cause. Do not disable or bypass the overload protector. Risk of compressor burnout and fire.
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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