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Domestic Hot Water
-
Follow operational sequence
Go to section 'c'
Turn the selector switch to
the 'Reset' position and
hold for at least 2
seconds. If regular
resetting is required, or
appliance still does not
operate investigation is
necessary
YES
Air pressure switch
proved
YES
NO
Go to section 'E'
Spark at ignition
electrodes for up to 10
seconds
YES
NO
~
neon illuminated
NO
Burner on
h
neon
illuminated
NO
Go to section 'F'
YES
Burner extinguishes
after 10 seconds
NO
YES
Go to section 'I'
Burner output modulates
to maintain temperature
set at thermostat
NO
Reduce the DHW flow
rate. If burner does not
modulate clean
temperature sensor and
DHW heat exchanger. If
modulation does not occur
go to section 'G'
YES .
DHW flow valve
senses no flow.
Primary water diverted to
CH system. DHW flow
switch released off
YES
NO
Diverter valve spindle
assembly faulty
'"
Fan stops
15.0
FAULT FINDING
YES
Replace DHW flow
microswitch
Replace PCB
Go to section 'J', 'L' & '0'
Turn the selector to the
reset position. If the light
does not extinguish go to
section H & K
Pump stops
Operation
sequence
correct
Turn selectorto
rF
Go to section 'A'
Q
neon illuminated
YES.
Is mainswater
I
YES
filter and differential
assemblyclean?
.
YES
Turn
rF thermostat to
I
NO
I
max. Open DHW tap fully.
----.-
DHWflow switch operated
YESJ.
.
NO
Continuityacross DHW
Primarywater is diverted
NO
flow microswitchterminals
from CH systemto DHW
----.-
and PCB - M1 connector
heat exchanger and flow
terminals 13 & 14
I
YES
microswitch operated
(terminals 12-14 open)
Go to section 'B'
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