R-Pro › Field cases › Refrigeration systems
Malfunction Due to Control Board (PCB) Failure
Likely causes
PCB malfunction from faulty electrolytic capacitor
Check: Visually inspect PCB for bulging capacitors, burn marks, or cracks
What to do: Visually inspect PCB for bulging capacitors, burn marks, or cracks → Measure PCB input/output voltages → Verify relay operation → Replace with same specification PCB → Confirm short cycling stops after replacement
Relay contact failure
Check: Measure PCB input/output voltages
What to do: Measure PCB input/output voltages → Verify relay operation → Replace with same specification PCB → Confirm short cycling stops after replacement
Solder crack or broken PCB trace
Check: Verify relay operation
What to do: Verify relay operation → Replace with same specification PCB → Confirm short cycling stops after replacement
If the compressor shuts off randomly without any protection device activating, suspect a control board failure.
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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