9 Faults and Warnings
Gardner Denver
32
Display
Possible Cause
Remedy
Fault E421:
Water change supply
Recurring error during water change in
intake stage (warning A628 already
activated):
Poor supply of water for machine, water
pressure may be too low.
Check water pressure.
Water treatment unit faulty.
Check.
Solenoid valve for water inlet faulty.
Check.
Faulty water level sensor B10.
Check level sensor and wiring.
Fault E422
:
Phase monitoring
Incorrect phase sequence.
Check phase sequence and correct if
necessary.
Loss of one or more phases.
Check the power supply.
