Troubleshooting - Kranzle therm 890 Operating Manual

Troubleshooting

Always remove the plug before working on the machine!
Malfunction
Water supply
Water tank runs over.
Water tank does not fill
completely.
Pump does not suck.
Test: check water and chemical
system for tightness.
High-pressure pump
Pump makes lots of noise.
Operating pressure is not
reached.
Water drops from the pump.
Oil drops from the transmission.
Pressure is too low
Machine does not switch off
Test: Disconnect pressure switch
(red) bridge on the panel
between terminal 5 + 6
IMPORTANT!!!
Cause of malfunction / Trouble shooting
Float valve is dirty.
Float valve is defect.
Water filter is dirty.
Check water inlet quantity.
Valves stick or are dirty.
Suction hose leaks.
Chemistry valve is open or leaks.
Check hose clips (connections).
High-pressure nozzle is clogged.
Connect water inlet directly to the pump (2-4 bar
pre-pressure).
Pump sucks air. Check suction connections.
Check high-pressure nozzle.
Check valves.
Check O-rings under valves.
Check sleeves.
Manometer is defect.
Unloader: check stainless steel seat and ball.
Check seals on the control piston.
Replace sleeves in the pump.
Replace O-rings.
Check oil seals (replace).
Check plunger and plunger guides.
Check water supply, since water deficiency or air
suction can cause damage to seals and O-rings
(chemistry valve leaks?).
Worn high pressure nozzle
Stainless steel seat, ball, O-ring in unloader is dirty
or defect.
Manometer is defect
Check return body and O-ring in unloader of the
valve housing.
Check pressure switch (red).
Check micro switch.
Check cable connections.
Board is defect.
23