Trouble Shooting - Stuart Turner Mainsboost Flomate MBF 12 Installation & Maintenance Instructions Manual

7 TROUBLE SHOOTING GUIDE
Symptoms
Pump will not start.
Pump starts when outlets
are off.
or
Pump cycles (hunts) on/off
frequently.
Pump runs on when all terminal
outlets are closed.
Probable Cause
No water.
Water supply.
Electrical supply.
Faulty reed switch/PCB
Internal motor thermotrip
activated.
Leak in system
Leak in system.
Reed clamp out of position.
Jammed flow switch.
Faulty reed switch or P.C.B.
Recommended Action
Check required flow of liquid is available to the fittings of
approx. 0.6 l/min.
Check water supply from mains and all stopcocks are open.
Check wiring connections.
If flow exists inline with requirements - check that all
electric switches are on.
Is the correct fuse fitted?
Check circuit breaker is set.
Refer to circuit test as detailed in 7.11.
Wait for thermotrip to auto reset and check that duty point
and run time is within specification (see Technical Section).
Check tap washers, w/c valve washers, pipe joints.
Check tap washers, w/c valve washers, pipe joints.
Ensure reed clamp is fitted correctly in location groove
(Fig. 5).
Remove flow switch reed clamp whilst pump is running. If
pump stops proceed to isolate the pump electrically and
hydraulically and remove brass housing that contains float.
Check for free movement.
Remove flow switch reed clamp whilst pump is running.
If pump continues to run, this indicates a closed circuit in
either the flow switch reed or P.C.B. in the terminal box,
these should be checked electrically.
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