31
Symptoms
Probable Cause
Recommended Action
No hot water
(contd)
Heat source not
operating.
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 runs on
with outlets
closed
or
Pump cycles
(hunts) on/off
frequently
Leak in system.
Check tap washers, w/c valve washers,
pipe joints.
Damaged reed
switch or P.C.B.
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.
Jammed flow
switch.
Remove outlet hoses and check that flow
switch sits in lowest position. Check float
for free movement.
Low pressure in
pressure vessel.
Check 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.
Flexible hose
leaks
Not fitted
correctly.
Check that the hose is pushed firmly onto
the pump inlet/outlet connections and
pipework.
Damaged ‘O’-
rings.
Check copper pipe ends are cleanly cut and
deburred.
