Table of Contents
Advertisement
56 FAULT FINDING DIAGNOSTIC CHART
Boiler will not light
NO
Is 230V ± 10%
available at
appliance ?
YES
NO
Do any external
controls call for
heat ?
YES
NO
Check boiler
programme timer and
status, as described
in Frame 28.
Does programme
timer require heat ?
YES
Observe the display. Take actions as
follows, depending upon the display:
STANDBY
Press [1/O] button
Press O/H reset
OVERHEAT
button.
FAULT
Press [COPY]
BOILER
Check wiring.
SENSOR
Press [COPY]
FAULT
BURNER
Press
[COPY]
LOCK OUT
Check fan
AIR FLOW
rotates.
FAULT
Replace if
necessary
Check wiring.
GAS VALVE
Press
FAULT
[COPY]
OUTSIDE
Check wiring.
SENSOR
Press [COPY]
FAULT
Check pump
PUMP FAULT
connections.
Press [COPY]
Concord CXC -
Installation
FAULT FINDING
Carry out electrical
checks.
Check all fuses.
Reset external
controls as
appropriate
Reset timer or
status as
appropriate
Replace o/h stat.
Check system.
Press [COPY]
Check system.
Press [COPY]
Check gas.
Is there a
Press
spark ?
[COPY]
YES
Check
pressure
Press
switch.
[COPY]
Replace if
necessary
Check gas
Replace faulty
pressure.
solenoid.
Press [COPY]
Press [COPY]
Change outside
sensor.
Press [COPY]
Check water
Change pump.
flow.
Press [COPY]
Refer to
Press [COPY]
screens
Replace sensor
Refer to
Press [COPY]
screens
Check HT leads
Check wiring to
and electrode
generator.
positions
Press [COPY]
Check
detection
probe.
Press
[COPY]
Check
gas
valve
wiring.
Press
[COPY]
Press [COPY]
Replace
generator.
Press [COPY]
Replace
detection
Refer to
screens
probe
Change
gas valve
or
Refer to
solenoid.
screens
Press
[COPY]
Refer to
screens
R
E
F
E
R
T
O
I
D
E
A
L
B
O
I
L
E
R
S
35
Advertisement
Table of Contents
