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A1.2 CIRCULATING PUMP FAULT DIAGNOSIS -
WILO YONOS PARA RS RKC
The indicator LED, located around the circumference of the red control knob can assist in diagnosing and rectifying a fault with the
pump. See the table below:
Table A1-2: Pump fault diagnosis
LED condition Meaning Diagnostic Cause Remedy
Green Pump operating
Pump runs according to the
red knob setting
Normal operation N/A
Flashes red and green
Pump is operating but
stopped
Pump restarts itself after
fault has disappeared
Undervoltage
Voltage <160V
OR
Overvoltage
Voltage >253V
Check supply voltage is
195V<V<253V
Overheating:
temperature inside motor
too high
Check water and ambient
temperature
Flashes red Pump not operating Pump stopped (blocked)
Pump does not restart itself
due to a permanent failure
Replace pump
LED o No power supply
No voltage to pump control
electronics
Pump is not connected to
power supply
Check cable connection
LED is damaged Check if pump is running
Electronics are damaged Replace pump
Appendix A1: Wilo Yonos PARA RS RKC
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