IDEAL Concord CX40 Installation & Service Manual page 31

49 PILOT LIT BUT NO MAINS GAS
Have you confirmed that the system controls
are calling for heat ?
Is there a supply voltage at the input plug
to the boiler ?
YES
Is the flue 'stat
fitted calling for
heat
Is there a supply voltage between the gas valve
terminals? Expect 230 V ± 10%
YES
Does the main burner light ?
After any faults have been corrected, return all
thermostatic and other controls to the previous
noted settings. Ensure that the sensor is
replaced in the thermostat pocket.
Refit the new board 'No.2'
Concord CX -
Installation
FAULT FINDING
YES
NO
Replace flue 'stat
YES
Replace the gas valve.
Does the main burner
light?
NO
YES
YES
YES
YES
Check the setting of the room thermostat
NO
and the cylinder thermostat
Check the control system
Check the supply voltage, e.g. by using a
NO
multimeter, set on the 300 V AC range, between
the L and N terminals. Expect 230 V ± 10%
If there is no supply, then check the fuse in the
plug or other supply point
Check that the boiler thermostat is calling
for heat; if necessary withdraw the sensor
NO
from the thermostat pocket.
YES
Is the gas valve
NO
functioning correctly?
YES
Does the main burner light ?
If Option Kit is fitted; remove boards
'No. 2' and 'No. 3' and connect board 'No. 1C'
into board 'No. 6A' as marked.
If the basic panel is fitted then continue.
Does the main burner light ?
YES
Fit a new board 'No. 1C'
Does the main burner light ?
YES
Replace old board 'No. 1C' and fit a new board
'No. 6A'.
YES
Refit the new board 'No. 1C'.
If Option Kit '1' or '2' is fitted then replace
YES
board 'No. 2' and 'No. 3'
Does the main burner light ?
YES
Fit a new board 'No. 2'
Does the main burner light?
YES
Replace the old board 'No. 2' and fit a new
NO
board 'No. 3'. Does the main burner light ?
NO
Replace the sensor
lead.
Does the main burner
YES
light?
NO
NO
NO
Does the main burner light?
NO
NO
NO
NO
NO
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