Kranzle 2160 TS Operating Manual page 23

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