10.2.2 Domestic hot water
Fig.70
Domestic hot water — Follow operational sequence
Turn on mains power
The display illuminates
20, 28, 40 or 321 flashing
118 flashing
09, 15, 110, 125, 133,
134, 135 or 384 flashing
Set Hot Water temperature to
Maximum & fully open hot tap
symbol flashing, pump
runs.
Go to section ‘A’
Go to section ‘D’
DHW flow rate greater
than 2litres/min
Burner lights
133 flashing
If 110 is still flashing
go to section ‘H’
YES
YES
NO
NO
NO
YES
YES
YES
NO
YES
YES
YES
NO
NO
NO
Go to section ‘I’
NO
Press the reset button for
1 to 3 seconds
YES
Fan runs after up to
3 minutes
160 flashing
Go to section ‘C’
NO
Fan runs at correct speed
160 flashing
Go to section ‘C’
Spark at ignition electrodes
up to 5 seconds & for
3 attempts
Go to section ‘F’.
Press the reset button for
1 to 3 seconds
YES
Burner lights
Go to section ‘E
’
Burner goes out after
5 seconds
128 flashing
Go to section ‘G
’
YES
YES
NO
109 flashing
125 flashing after 1 min
Go to section ‘J’
YES
YES
110 flashing
NO
Go to section ‘H’
YES
NO
Diverter Valve open to
Domestic Hot Water circuit
NO
Go to section ‘K’
YES
Burner modulates to
maintain set temperature
Check CH NTC sensor.
Go to section ‘D’
NO
130 flashing
NO
Go to section ‘M’
YES
Burner goes out
NO
Fan stops after 10 seconds
YES
Boiler operation correct
YES
Go to section ‘L’
NO
Go to section ‘L’
Go to section ‘B’
YES
If 09, 15, 110 or 384 is flashing or re-occurs
regularly, check all PCB connections. If this
has no effect replace the PCB.
PN-0000316
10 Troubleshooting
66
