User guide

53
13 Fault nding
13.2 Fault nding chart 2. Check domestic hot water operation.
13.3 Fault nding chart 3. Check central heating operation.
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Diagram 13.5
Diagram 13.6
4
Ensure DHW taps
are closed
Put CH temperature
Is overheat
thermostat LED flashing?
Check and if
necessary replace
Check and if
necessary reset or
replace
Ensure external controls
are calling for heat
Does pump run ?
No
Yes
Yes
Yes
No
Yes
Check and if
necessary replace
Check and if
necessary replace
No
No
Is 230 V AC
present on terminals of
Is CH sensor LED
flashing ?
Go to chart 5