Common Faults with Booster Sets

Possible cause(s)	Recommended action
Minimum pressure requirement not reached within set period when filling system for the first time	Turn off main electrical isolator Close discharge isolation valve Vent pumps Turn on main electrical isolator Check unit runs up to set pressure and pump motors shut down Open discharge valve slowly ensuring set pressure is maintained

Possible cause(s)	Recommended action
No electrical power	Check and rectify
Blown fuse	Check and rectify
Overload trip	Check and (if necessary) reset the overload trip value.

Possible cause(s)	Recommended action
The rotating part(s) of the pump is/are partially or completely obstructed e.g: impeller obstructed by foreign matter	Strip the pump to inspect and rectify
Pump not primed - WARNING: running the pump ‘dry’ can cause serious damage to the mechanical seal.	Having first checked the mechanical seal for damage, prime and air-bleed the pump and try again
Valve in suction pipework closed or partially closed.	Check all appropriate valves are fully open.
Incorrect pump rotation	Check and rectify.

Possible cause(s)	Recommended action
Pump is cavitating	Increase the discharge back pressure slightly by progressively closing a manual isolating valve on the discharge side until the cavitation stops.
Motor bearings worn	Check and rectify
The rotating part(s) of the pump is(are) partially or completely obstructed. e.g: impeller obstructed by foreign matter.	Strip the pump to inspect and rectify

Possible cause(s)

Recommended action

If the pump has a “Hand Control” option on it’s control panel.

Switching to “Auto” should restore normal control.
If normal control is not returned an immediate service visit is required.

Pump has no “Hand Control” option.

An immediate service visit is required.

Possible cause(s)	Recommended action
Pipework or the pump chamber has a partial blockage.	Check and rectify
Momentary loss of one phase of power supply.	Check and try again.
Discharge flow rate too high.	Reduce by the discharge flow rate by increasing the discharge back pressure slightly, progressively closing a manual isolating valve on the discharge side: then try again
Overload trip setting too low for rated duty	Check and (if necessary) reset the overload trip value