1. Min. Threshold Error 22 - when initially filling the system
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 valveslowlyensuring set pressure is maintained
2. Pump will not start
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.
3. Low (or zero) output discharge rate
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.
4. Pump vibrates and/or is noisy
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
5. Pump runs continuously
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.
6. Overload trip
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
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