Domestic Hot Water - Main Eco Compact Combi 25 Installation And Service Manual

10 Troubleshooting
Fig.70 Domestic hot water — 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 Hot Water temperature to
Maximum & fully open hot tap
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
Domestic Hot Water circuit
YES
Burner modulates to
maintain set temperature
NO
130 flashing
NO
Burner goes out
66
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
DHW flow rate greater
NO
than 2litres/min
NO
160 flashing
Go to section 'C'
160 flashing
NO
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 CH NTC sensor.
Go to section 'D'
YES
Go to section 'M'
YES
Fan stops after 10 seconds
10.2.2

Domestic hot water

If 110 is still flashing
go to section 'H'
Go to section 'L'
NO
YES
Burner lights
YES
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
If 09, 15, 110 or 384 is flashing or re-occurs
regularly, check all PCB connections. If this
has no effect replace the PCB.
Go to section 'L'
Go to section 'B'
PN-0000316