Stuart Turner PH 35 ES B - Manual (Page 17)

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TROUBLE SHOOTING GUIDE
Symptoms Probable Cause Recommended Action
Pump will not start. Electrical supply. Check wiring connections.
Check all switches are ‘on’.
Check fuse (see fuse section).
Check circuit breaker is set.
Faulty reed switch/PCB. Refer to circuit test as detailed in Fig. 15
Recommended static inlet/outlet
heads exceeded. Re-position pump (see pump location section).
Internal motor thermotrip
activated. Wait for thermotrip to auto-reset and check that duty point,
run time and ambient temperature are within specification
(see technical specification).
Water starvation to pump. Refer to ‘dry running’ section.
No hot water. Air locked water feed. Vent hot water pump of air.
Check cold feed to hot water cylinder.
Check water level in cold water tank and that all stopcocks
are open.
Boiler is switched off. Check boiler is switched ‘on’.
Check cylinder thermostat.
Check immersion heater.
Check cylinder contains hot water.
All hot water has been used. Check tank volume is adequate.
Faulty thermostatic mixer valve. Consult makers instructions.
Pump starts when outlets are off. Leak in system. Check tap washers, w/c valve washers, pipe joints.
or
Pump cycles (hunts) on/off
frequently.
Low pre-charge pressure in
pressure vessel. Check pre-charge pressure in pressure vessel
(see maintenance section).
Debris under non-return valve
sealing face. Run at full flow to try and flush away debris or remove, clean
or replace non-return valve.
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).
Faulty reed switch or P.C.B. 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.
Jammed flow switch. Isolate the pump electrically and hydraulically and remove
brass housing that contains the float. Check float for free
movement.
Reduced flow/performance. Blocked inlet strainers. Clean inlet strainers (see maintenance section).
Blocked shower head spray
plate. Clean in accordance with manufacturers instructions.
Blocked pipework or pump. Isolate pump electrically and hydraulically, locate blockage
and remove.