Baxi EcoBlue System 12 - Fault Finding Solutions Sections

66 EcoBlue System 7219708 - 01 (04/15)
11 Troubleshooting
Fault Finding Solutions Sections
Is there 230V at:
Main terminals L and N Check electrical supply
1.
NO
Main terminal fuse Replace fuse
Display
illuminated
2.
NO
PCB - X10 connector
Main terminals L and N
Check wiring
3.
NO
NO
A
B
C
NO
Fan connections correct at fan &
PCB X11 and X23 connectors -
see Wiring Diagram.
Make connections
Fan jammed or
faulty wiring
Connection
OK at X40
Display or
Main PCB
fault
230V at PCB - X11 connector 3 to 4
NO
Replace PCB
YES
230V at pump
YES
Replace
pump
NO
Check wiring
230V at PCB - X11 connector
(between blue & brown - see Wiring
Diagram)
YES
NO
Replace PCB
Replace fan or wire
YES
YES
Temperature sensor faulty.
Check correct location and wiring.
NO
D
Replace sensor &
reset boiler
YES
Gas at burner
Ensure gas is on and purged
Replace PCB
Replace gas valve &
Check combustion
Check wiring and PCB - X14
connector see Wiring Diagram
YES
NO
NO
E
Cold resistance approximately
10k @ 25° C (CH sensor)
20k @ 25° C (Flue sensor)
(resistance reduces with increase in temp.)
Switch to DHW mode maximum flow & press reset.
During next three minutes check :-