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Fault
Pump not
running
Loud noises
(> 43 dB(A))
HEP Optimo/HEP Optimo (N)/
HEP Optimo Geo
E1
E2
E3
E4
E5
E6
E7
E8
44
Cause
No operating
voltage
Rotor/shaft
blocked, digital: fast
LED flashes
Air in the system
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
Overvoltage
Undervoltage
Blocked rotor
Dry running
Overload
Winding fault
Short circuit
Pump motor error
www.armstrongfluidtechnology.com
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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