17
NO
Is the programm-
er set to central
heating or not
switched on?
Check and
set to hot
water pro-
gramme
Is the mo-
trized valve
operating
correctly?
Check wiring
or plumbing
connections
Has cylinder
thermal
cut-out
operated?
Check and
press reset
button
Is the boiler
working?
Is thermostat wired
as per layouts for ‘S’
or ‘Y’ plan
installation?
Connect wiring as
per instructions
Check cylinder ther-
mostat is switch-
ing on & off with
programmer & hot
water on
Is 2-port moto-
rized valve closing
when cylinder
reaches tempera-
ture?
Check wiring on
cylinder thermostat
Wiring fault
Seek advice
from electrician
Thermostat/solar
controller set too
high
Reduce tempera-
ture setting
Faulty thermostat
Replace
Hot water from taps is cold
If problem stil persists contact a competent
engineer/plumber
Excessive hot water from taps
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
!
If in doubt at any stage consult a qualified installer / electrician
