Stuart Turner Monsoon U1.5 bar Twin Installation, Operation & Maintenance Instructions Manual page 33

Symptoms
No hot water
(contd)
Pump runs on
with outlets
closed
or
Pump cycles
(hunts) on/off
frequently
Flexible hose
leaks
Probable Cause
Heat source not
operating.
All hot water has
been used.
Faulty
thermostatic mixer
valve.
Leak in system.
Damaged reed
switch or P.C.B.
Jammed flow
switch.
Low pressure in
pressure vessel.
Debris under
non-return valve
sealing face.
Not fitted
correctly.
Damaged 'O'-
rings.
Recommended Action
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 hoses 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.
31