Fault finding 8
uniSTOR GB
23
Fig. 16
Water discharging from expansion
relief valve.
Manually reset / seat expansion relief
valve. Is discharge still occuring?
Check pressure charge
in expansion vessel
Reset pressure in
expansion vessel
Does pressure hold?
Turn off boiler and
immersion heater. Is
discharge still occuring?
YES
NOT OK
Is the discharge occuring only when the
cylinder is being heated?
YES
NO
Is pressure downstream
of pressure limiting valve
less than 3.0 bar?
YES
YES
NO
Exchange pressure
limiting valve.
Exchange
expansion vessel.
NO
Is operation now
OK?
YES
NO
Exchange expansion
relief valve.
OK
Fault remedied.
YES
NO
NO
Fault B:
