7
Fault finding guide
Fault Possible Cause Remedy
Pump fails to start
Power supply failure
Control panel fuse blown,
MCB tripped
Remote inhibit active
Low water level
Reinstate incoming power supply
Replace power supply fuse
Reset MCB
Turn remote inhibit off
Reinstate water supply
Pump fails to stop
Set point set too high
Manual operation selected
System pressure low due
to large leak
Lower set point
Select Auto operation
Switch unit off until leak is repaired
Pump switches on and off
quickly
Air in system
Vessel pre-charge
incorrect
Purge air from pumps and pipework
Check vessel pre-charge and Charge as
necessary with Nitrogen or dry air
Pump runs but will not
make pressure
Pump air locked
Commissioning valve left
open
Incorrect rotation
Passing too much water
Open pump bleed screw and vent pump
Check commissioning valves are in
correct position.
Check pump internal connections.
Check system for leaks
Pump overheating Pump partially seized.
Remove pump and check for sediment
build up or foreign objects
Pump set frequently
starting. (pressure falls
to cut in point)
Newly installed system
with large amount of air in
pipe work
Leaks in system pipe work
Vessel pre-charge
incorrectin open position
Bleed system to remove air
Repair leaks
Isolate vessel and pre-charge with
Nitrogen as appropriate
Break tank overflowing
Leaking ball valve
Non-return valve letting by
Commissioning valve left
in open position
Replace ball valve seal
Replace/clean non-return valve
Close commissioning valve
Pump stops and
pressure drops
immediately
Non-return valve letting by
Vessel pre-charge incorrect
Replace non-return valve
Check vessel pre-charge and Charge as
necessary with Nitrogen or dry air
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