Stuart Turner LFL Automatic Flow Switch - Manual (Page 18)

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TROUBLE SHOOTING GUIDE
Symptoms Probable Cause Recommended Action
Pump will not start. No liquid. Check required gravity flow of liquid is available to the fittings
of approx. 0.6 l/min (RGFL/RGDFL/ESFL models) or approx.
1 l/min (KFL & LFL models).
Liquid supply. If NO... check liquid level in the supply tank and all stopcocks
are open.
Filter blocked. Remove and clean system filters.
Electrical supply. Check wiring connections.
If gravity flow exists inline with requirements - check that all
electric switches are on.
Is the correct fuse fitted?
Check circuit breaker is set.
Faulty reed switch/PCB Refer to circuit test as detailed in Fig. 15.
Internal motor thermotrip
activated. Wait for thermotrip to auto reset and check that duty point and
run time is within specification (see Technical Section).
Pump starts when outlets are off.
or
Pump cycles (hunts) on/off
frequently.
Leak in system Check tap washers, w/c valve washers, pipe joints.
No hot water. Air locked. Bleed pump to air.
Water feed. Check cold feed to hot water cylinder.
Check water level in the supply tank and all stopcocks are
open.
Boiler is switched off. Check boiler is switched On.
Check cylinder thermostat is set.
Is immersion heater operating?
Check temperature of cylinder?
Faulty thermostatic mixer valve. Consult makers instructions.
Pump runs on when all terminal
outlets are closed. Leak in system. Check tap washers, w/c valve washers, pipe joints.
Reed clamp out of position. Ensure reed clamp is fitted correctly in location groove
(Fig. 15).
Jammed flow switch. 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.
Faulty reed switch or P.C.B. 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.
Reduced flow/performance. Blocked inlet strainers. Clean inlet strainers (see maintenance section).