New Unit Information 02.2004
HD 5/12
Troubleshooting
Page 11 / 12
Troubleshooting
Fault
Solution
Unit not running
– Check/replace mains voltage, connection cable and mains
fuse.
– Check/replace unit switch.
– Check/replace pressure switch.
– Check/replace overflow valve.
– Check/replace motor.
Unit does not become
pressurised
– Check/increase water inlet volume.
– Clean/replace water inlet strainer.
– Bleed unit.
– Check/replace high-pressure hose.
– Check cylinder head for leaks and replace as necessary.
– Check/replace overflow valve.
Unit constantly switches on
and off with handgun closed
– Check/replace handgun and o-rings at high-pressure hose
for leaks.
– Check/replace cleaning agent non-return valve.
– Check/replace pressure/suction valves for leaks.
– Check/replace overflow valve.
– Check/replace non-return valve.
– Check/replace pressure switch.
Unit won't switch off when
the handgun is closed
– Check/replace overflow valve.
– Check/replace non-return valve.
– Check/replace pressure switch.
Cleaning agent is not drawn
in
– Clean/replace cleaning agent non-return valve.
– Check/replace cleaning agent nozzle.
– Replace injector.
– Clean/replace cleaning agent strainer.
– Check replace metering valve.
Water escapes between the
cylinder head and piston
housing
– Check replace high-pressure and low-pressure seals.
Oil escapes between the
cylinder head and piston
housing
– Replace the oil seals.
