Fault
Cause
Pump not
No operating
running
voltage
Rotor/shaft
blocked, digital: fast
LED flashes
Loud noises
Air in the system
(> 43 dB(A))
Air in the pump
Pump flow too high • Reduce the pump speed using the knob or button
Cavitation due to
insufficient supply
pressure
Foreign matter in
pump housing
HEP Optimo/HEP Optimo (N)/
HEP Optimo Geo
E1
Overvoltage
E2
Undervoltage
E3
Blocked rotor
E4
Dry running
E5
Overload
E6
Winding fault
E7
Short circuit
E8
Pump motor error
Action
• Check the electrical system.
• Isolate the pump from the power supply
• Remove the vent screw (see p. 43/44)
• Turn the shaft clockwise using a screwdriver (4 mm)
• Screw in the vent screw
• Switch on the pump
• Bleed the system
• Bleed the pump (see p. 43/44)
• Check the operating pressure of the system
• Increase the system threshold values
• Clean the housing
Ensure admissible voltage supply, then error will be eliminated
Ensure admissible voltage supply, then error will be eliminated
Vent screw to unblock shaft manually, restart pump
Open valve, fill medium, vent pump
Replace pump with pump with higher power motor
Remove supply voltage and replace pump
Remove supply voltage and replace pump
Replace the pump
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