Storch 120 Compact Originalbetriebsanleitung Seite 56

Problem:
After closing the safety trigger gun, the pressure control valve-
safety valve keeps switching. The stainless steel pressure gauge
continuously displays full pressure.
Possible cause No. 1:
Leckage.
Having closed the safety trigger gun, the pressure control valve/
safety valve must switch and the stainless steel pressure gauge
must show „0" bar. Failing to switch and with the stainless steel
pressure gauge continuously showing full pressure, this could be
due to leakage at the high-pressure pump, at the pressure switch,
at the highpressure hose or at the safety trigger gun.
Problem:
After closing the safety trigger gun, the pressure control valve-
safety valve keeps switching. The stainless steel pressure gauge
continuously displays full pressure.
Possible cause No. 2:
The non-return valve is defective.
Proceeding:
Switch off the high-pressure cleaner and pull plug from socket.
Stop water supply. Operate safety trigger gun catch several times
to decrease the pressure. Unscrew pump outlet.
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Proceeding:
Check connections from the high-pressure cleaner to the high-
pressure hose and from the high-pressure hose to the safety trig-
ger gun and also the connection between lance and safety trigger
gun for tightness.
Switch off the cleaner. Shortly press the trigger of the trigger gun
with safety catch to decrease the pressure. Remove high-pressu-
re hose, trigger gun with safety catch and lance and check the
O-rings. If the O-rings are damaged they have to be replaced.
In case of a leakage there is no guarantee for possi-
ble consequential damages.
Remove check body and check O-Ring for soiling or damage. Also
check seal seat inside pump housing for soiling or damage.
If sealing rings are defective replace O-rings at once.
There is no guarantee if the high-pressure pump is
damaged by defective O-rings due to air induction
or lack of water (cavitation).
Translation of the original instruction