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68
EcoBlue System
7219708 - 01 (04/15)
11
Troubleshooting
I
Temperature sensors faulty.
Cold resistance approximately
10k @ 25° C (CH sensor)
20k @ 25° C (Flue sensor)
(resistance reduces with increase in temp.)
NO
Replace sensor
YES
If pump is running the heat exchanger
could be obstructed
Replace heat exchanger
1.
2.
Replace hydraulic pressure sensor
YES
Restore correct system pressure
YES
NO
CH system pressure less than
0.5 bar or greater than 2.7 bar
on digital display
Check wiring and PCB -
X22 connector for approx.
5V DC between green &
black - see Wiring Diagram
Replace PCB
NO
J
Replace sensor
NO
System fault - correct
NO
YES
Ensure that the boiler and
system are fully vented
Check flow temperature sensor connections
and position.
Cold resistance approximately
10k @ 25° C (CH sensors)
(resistance reduces with increase in temp.)
YES
Go to section ‘B’
K