Proceeding:
Switch off machine and pull plug from
socket. Stop water supply. Unscrew pump
outlet.
The pressure gauge shows full pressure although the gun has
been closed. The pressure switch valve switches constantly.
There is no guarantee if the pump is damaged by
defective O-rings due to air induction or lack of water
(cavitation).
23
Replace non-return valve if necessary.
Take out check ball and check for soiling
or damage of ball or stainless steel seat
inside the pump housing.
Possible cause no. 2: The non-return valve is soiled or defective.
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