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10.2
Fault finding
Fig.69
Central heating — Follow operational sequence
Turn on mains power
The display illuminates
YES
09, 15, 110, 125, 133,
134, 135 or 384 flashing
NO
20, 28, 40 or 321 flashing
NO
118 flashing
NO
Set Central Heating
temperature to Maximum.
symbol flashing,
pump runs
YES
Fan runs after up to
3 minutes
YES
Fan runs at correct speed
YES
Spark at ignition electrodes
up to 5 seconds & for
3 attempts
YES
Burner lights
YES
109 flashing
NO
110 flashing
NO
Diverter valve open to
Central Heating circuit
YES
Burner modulates to
maintain set temperature
NO
130 flashing
NO
Burner goes out
NO
Go to section 'A'
YES
Press the reset button for
1 to 3 seconds
YES
Go to section 'D'
YES
Go to section 'I'
NO
Ensure all controls and
NO
programmers are calling
for heat
NO
160 flashing
Go to section 'C'
NO
160 flashing
Go to section 'C'
NO
133 flashing
Go to section 'E'
NO
YES
Burner goes out after
5 seconds
YES
125 flashing after 1 min
YES
Go to section 'H'
NO
Go to section 'K'
NO
Check Heating flow sensor.
Go to section 'D'
YES
Go to section 'M'
YES
Fan stops after 10 seconds
10.2.1
Central heating
If
110 is still flashing
go to section 'H'
Ensure controls are set to
demand and verify the
contacts are closed
YES
Go to section 'B'
Go to section 'F'.
YES
Press the reset button
for 1 to 3 seconds
YES
128 flashing
Go to section 'G'
Go to section 'J'
YES
Boiler operation correct
See
Electrical diagram, page 18 for position of terminals and compo
nents.
If
09, 15, 110 or 384 is flashing or re-occurs
regularly, check all PCB connections. If this
has no effect replace the PCB.
10 Troubleshooting
PN-0000315
65
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