52
15. Troubleshooting
CPA-E and CPA-E S PWM series
Warning
Ensure that the power supply is switched off before the
pump is maintained or repaired.
Failure
Control panel
Cause of failure
Remedy
Fuse Replace
Pump cannot
Indication light
blown
fuse
be switched
OFF
Circuit breaker
Connect the
on
not connected
circuit breaker
Motor failure
Replace the pump
E1
Undervoltage
Check the power
supply
E2
Pump stalling
Clean the pump
Noise
In W
Air in system
Bleed the system
generation
Flow rate too high
Increase the
inlet pressure
Noises generated
In W
Air inside pump
Bleed the system
by the
Inlet pressure
Increase the
pump
too low
inlet pressure
Not hot enough
In W
Poor pump
Increase the
performance
inlet pressure
GB
High-efficiency heating and solar circulation pumps
