Concord CX -
Installation
31
YES
Refit the new board 'No. 1C'.
NO
NO
Fit a new board 'No. 1C'
Does the main burner light ?
Replace old board 'No. 1C' and fit a new board
'No. 6A'. Does the main burner light?
NO
YES
YES
NO
Refit the new board 'No.2'
If Option Kit '1' or '2' is fitted then replace
board 'No. 2' and 'No. 3'
Does the main burner light ?
Fit a new board 'No. 2'
Does the main burner light?
Replace the old board 'No. 2' and fit a new
board 'No. 3'. Does the main burner light ?
YES
YES
YES
NO
YES
Check the setting of the room thermostat
and the cylinder thermostat
Check the control system
Check the supply voltage, e.g. by using a
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
from the thermostat pocket.
NO
NO
49 PILOT LIT BUT NO MAINS GAS
NO
NO
Have you confirmed that the system controls
are calling for heat ?
YES
FAULT FINDING
YES
Is there a supply voltage at the input plug
to the boiler ?
Does the main burner light ?
YES
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 ?
NO
Replace the gas valve.
Does the main burner
light?
YES
Is there a supply voltage between the gas valve
terminals? Expect 230 V ± 10%
NO
NO
YES
YES
Is the flue 'stat
fitted calling for
heat
Replace flue 'stat
YES
NO
NO
NO
YES
Is the gas valve
functioning correctly?
YES
NO
YES
F
AUL
T FINDING
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.
Replace the sensor
lead.
Does the main burner
light?
Does the main burner light ?
Summary of Contents for Concord CX40
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