16
Reduced expan-
sion volume
Repressurize
expansion vessel,
see pt. 5.3
Mains supply off
Open supply
valve
Line strainer
blocked
Clear line
strainer
Thermal control
failure
Switch off power to
immersion heaters
and boiler supply to
the unit. When dis-
charge has stopped
check thermal con-
trols and replace as
necessary
Cold water PRV
incorrectly fitted
Check and refit
as required
Intermittent water discharge
If problem stil persists contact a competent
engineer/plumber
No water flow from hot taps
If problem stil persists contact a competent
engineer
5.5 Fault finding flow charts
YES
YES
YES
YES
YES
NO
NO
!
If in doubt at any stage consult a qualified installer / electrician