All switches including thermostat on test leads from L to E -
if meter reads other than infinity (∞) there is a fault which
should be isolated. A detailed continuity check is required to
trace the faulty component.
IMPORTANT: These series of checks are the first elec-
trical checks to be carried out during a fault finding
procedure. On completion of the service / fault finding
task which has required the breaking and remaking of
electrical connections then the checks 6.1 Earth conti-
nuity, 6.3 Polarity and 6.4 Resistance to earth must be
repeated.
17
Does pilot
alight?
Is main power
available at
the external
socket?
Make
power
available
Does the fan
run at the
low speed?
Is fuse
at main
plug OK?
Is there an
electrical
supply
to fan?
Check the
flying lead of
the fan
Is the feeding
lamp
lights on?
Replace
fuse
Push the gas
supply button
Are at least
100 VAC
available?
Is there a
spark after
15 secs.?
Check the
ignition elec-
trode and
electr. supply
Replace the
fan
condenser
Keep pressed
(20 scds. at
least) the gas
valve button
Does the pilot
flame keep
lighting on?
Air bubbles in the gas supply or the
overheat thermostat
has switched off the gas valve
Check
the PCB fuse
Replace fan
YES
NO
NO
YES
YES
YES
NO
NO
YES
NO
NO
YESNO
YES NO
YES
NO
YES
Check the gas
feeding and
clean the
nozzle orifice
Release the
gas valve
button
Check if
thermocouple
is correctly
enveloped
6.5 FAULT FINDING - PILOT (“FRIENDLY” model)
Room thermostat open, no D.H.W. request and all D.H.W. taps off.
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