R-Pro › Field cases › Refrigeration systems
Controller (board) displays error code
Likely causes
Sensor open or short circuit
Check: Look up error code in model-specific manual
What to do: Look up error code in model-specific manual → Measure associated sensor resistance (check open/short) → Check board input power voltage → Inspect connector contacts and reseat connectors → Reset error code and monitor for recurrence
Unstable board power supply
Check: Measure associated sensor resistance (check open/short)
What to do: Measure associated sensor resistance (check open/short) → Check board input power voltage → Inspect connector contacts and reseat connectors → Reset error code and monitor for recurrence
Communication error (multi-unit system)
Check: Check board input power voltage
What to do: Check board input power voltage → Inspect connector contacts and reseat connectors → Reset error code and monitor for recurrence
Board failure
Check: Inspect connector contacts and reseat connectors
What to do: Inspect connector contacts and reseat connectors → Reset error code and monitor for recurrence
Photograph the error code before resetting — useful for identifying recurrence patterns
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
Open R-Pro →Related cases
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- Air Curtain Weakening
- Excessive Temperature Rise After Defrost
- Excessive Heat Load from Direct Sunlight or Lighting