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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.
Faulty reed switch/PCB.
Recommended static
inlet/outlet heads exceeded.
Internal motor thermotrip
activated.
Water starvation to pump.
Check wiring connections.
Check all switches are ‘on’.
Check fuse (see fuse section).
Check circuit breaker is set.
Refer to circuit test as detailed in Fig. 18.
Re-position pump (see pump location section).
Wait for thermotrip to cool and auto-reset and investigate
cause of problem before re-starting.
Refer to ‘dry running’ section.
No hot water.
Air locked water feed.
Boiler is switched off.
All hot water has been used.
Faulty thermostatic mixer
valve.
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.
Check boiler is switched ‘on’.
Check cylinder thermostat.
Check immersion heater.
Check cylinder contains hot water.
Check tank volume is adequate.
Consult makers instructions.
Pump starts when outlets
are off.
or
Pump cycles (hunts) on/off
frequently.
Leak in system.
Low pre-charge pressure in
pressure vessel.
Debris under non-return
valve sealing face.
Check tap washers, w/c valve washers, pipe joints.
Check pre-charge pressure in pressure vessel
(see maintenance section).
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.
Reed clamp out of position.
Faulty reed switch or P.C.B.
Jammed flow switch.
Check tap washers, w/c valve washers, pipe joints.
Ensure reed clamp is fitted correctly in location groove
(Fig. 18).
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.
Isolate the pump electrically and hydraulically and remove
brass housing that contains the float. Check float for free
movement.
Reduced flow/performance.
Blocked inlet strainer.
Blocked shower head spray
plate.
Blocked pipework or pump.
Clean inlet strainer (see maintenance section).
Clean in accordance with manufacturers instructions.
Isolate pump electrically and hydraulically, locate blockage
and remove.
