Trouble Shooting - Stuart Turner CH 4-30 B Installation, Operation & Maintenance Instructions Manual

8 TROUBLE SHOOTING GUIDE
Symptoms
Pump will not start.
Reduced/intermittent flow.
No hot water.
Pump runs on with outlets
closed.
or
Pump cycles (hunts) on/off
frequently.
Flexible hose leaks
Probable Cause
Electrical supply.
Pump Jammed.
Damaged pressure switch.
Recommended static inlet/outlet
heads exceeded.
Internal motor thermotrip
activated.
Incorrect or no anti-aeration
flange fitted
Incorrect pipe sizes.
Blocked inlet filters.
Hot water temperature set too
high.
Blocked shower head spray
plate
Air locked water feed.
Heat source not operating.
All hot water has been used.
Faulty thermostatic mixer valve.
Leak in system.
Damaged reed switch, P.C.B or
pressure switch.
Jammed flow switch.
Low pressure in pressure
vessel.
Debris under non-return valve
sealing face.
Not fitted correctly.
Damaged 'O'-rings.
Recommended Action
Check power supply.
Check fuse (see fuse section).
Check circuit breaker is set.
Check wiring connections.
If motor 'Buzzes' switch off power and contact Stuart Turner.
Turn off power.
Release system water pressure.
Turn on power, pump should start. If NOT contact Stuart
Turner.
Re-position pump (see pump location section).
Wait for thermotrip to auto-reset and check that duty point and
run time is within specification (see technical specification).
Check that the installation complies with installation
instructions.
Check for correct pipe sizing, see Page 7 - Section 2.19.
Clean inline strainer (if fitted).
Reduce cylinder stat setting to 60
Clean in accordance with manufacturers instructions.
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.
Check boiler is switched 'on'.
Check cylinder thermostat.
Check immersion heater.
Check cylinder contains hot water.
Check tank volume is adequate.
Consult makers instructions.
Check tap washers, w/c valve washers, pipe joints.
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. Contact Stuart Turner.
Remove outlet connection and check that flow switch sits in
lowest position. Check float for free movement.
Check 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.
Check that the hose is pushed firmly onto the pump inlet/
outlet connections and pipework.
Check copper pipe ends are cleanly cut and deburred.
- 20 -
C max.
o
Cont ...