Troubleshooting
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Faults and their solutions - pump
9 Troubleshooting
9.1 Faults and their solutions - pump
The following list offers an overview of possible faults on the pump. The list
is not complete, but in the event of a malfunction it can be helpful in local-
ising and rectifying the fault.
Failure Cause Remedy
Pump does not suck The priming pump is not
switched on
Switch on priming pump
Suction lift too high Reduce suction lift
Suction strainer not below
water
Place suction strainer below water
Blocked suction strainer Clean suction strainer
Suction hose defective or
suction seals poorly inserted
or damaged
Insert or replace suction hose gaskets
properly
Blocked suction sieve Clean suction sieve
External suction valve closed Opern external suction valve
Drain cock not closed Close drain cock
Pressure valve leaks are
caused by foreign bodies or
damaged valve seals
Clean pressure valve (rinse with purified
water) or change the valve seal
Torn or oily v-belt Clean or replace V-belt
Pump suction weak Input and/or exhaust valves of
the priming pump are dam-
aged
Change input and/or exhaust valves
Pump is noisy and vi-
brates
Suction lift too high Reduce suction lift
Pump cavitates Reduce speed and nozzle diameter; clean
suction strainer and suction sieve
Pump has low perfor-
mance
Blocked suction strainer Clean suction strainer
Suction hose defective or
suction seals poorly inserted
or damaged
Insert or replace suction hose gaskets
properly
Blocked suction sieve Clean suction sieve
Engine power weak Check the engine
Pressure valve not fully
opened
Open the pressure valve completely
Meter does not dis-
play anything
Meter defect Replace meter
Plug not connected Connect plug
PIN assignment incorrect Correctly wire PIN assignment
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