Owner's manual

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NOISE
The equivalent continuous A-weighted sound pressure level at a distance of 1 metre
from the pump does not exceed 70 dB(A).
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 pressure switch. Turn off power.
Release system water pressure.
Turn on power, pump should start.
If NOT refer to circuit test in Fig. 22 to confirm PCB operating
correctly.
Faulty PCB. Refer to circuit test as detailed in Fig. 22.
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 and
run time is within specification (see technical specification).
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
and isolating valves 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.
Faulty reed switch, P.C.B or
pressure switch.
If pump continues to run, this indicates a closed circuit in
either the flow switch reed, pressure switch or P.C.B. in the
terminal box, these should be checked electrically.
Jammed flow switch. Consult Stuart Turner for test procedure.
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.