46
47
Water supply
High-pressure pump
Problem Possible cause
Float valve is dirty/defect
Float valve is defect, water inlet filter dirty,
water intake too low
Valves sticky or are dirty, suction hose leaks,
detergent valve is open or leaks, Check hose
connections, high-pressure nozzle is clogged
Connect water inlet directly to the
high-pressure pump (2-8 bar pre-pressure).
Disconnect suction lines below the
high-pressure pump.
Water tank runs over
Water tank does not fill completely
High-pressure pump does not suck
Test: Check water and additive
suction system for tightness
High-pressure pump sucks air, check sucti-
on connections and high-pressure nozzle,
check O-rings and valves, check sleeves.
Unloader: Check stainless steel seat and
ball. Check seals on the control piston.
Replace sleeves in the high-pressure pump.
Replace O-rings
High-pressure nozzle washed out, stainless
steel seat, ball, O-ring in unloader is dirty
or defect.
High-pressure pump makes lots
of noise. Operating pressure is not
reached
Water drops from the
high-pressure pump
Pressure is too low
Summary of additional causes of malfunction
Check/replace oil seals.
Check plunger and plunger guides.
Oil drops from the transmission
High-pressure cleaner start/stop
Check return body and O-ring in
unloader of the valve housing.
Check pressure switch, check micro switch,
check cable connections.
Check electricity supply, check main switch,
check cable connections, board is defect.
Switch off by overcurrent release.
Check micro switch.
Check electricity supply, check main switch,
check cable connections. Switch off by over-
current release. Check micro switch.
High-pressure cleaner
does not switch off
Test: Jumper pressure switch
High-pressure cleaner does not
start or stopps during operation
High-pressure cleaner does not
Leckage
Gun defective. Let repair.
Replace seals. Replace O-ring under
screwed connection.
Clean high-pressure nozzle
Trigger gun with safety catch drips
High-pressure hose drips
Stainless steel pressure gauge shows
pressure but no water comes out
Sucking detergent
High-pressure pump sucks air.
Check hose clips.
Test: Connect water line to the high-
pressure pump. No water must come
from the detergent hose
Detergent is not sucked
In case of repeated mulfunction or should you be incapable of resolving
it by yourself, please contact our customer service.
Pull plug from socket prior to starting any repair work!
Small repairs - do it yourself
Small repairs - do it yourself
Summary of Contents for therm 1165-1
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