Fault Finding Solutions Sections - Baxi EcoBlue System 12 Installation And Service Manual

11 Troubleshooting

Fault Finding Solutions Sections

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