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