© Baxi Heating UK Ltd 2008
38
Overheat Lockout
Refer to the boiler wiring diagram
Lockout Burner Mains
No
Yes
No
Yes
Fal
s
e Flame Fault
Refer to the boiler wiring diagram
Lockout
Burner
Mains
Yes
No
Replace electrode
No
Set gap to correct
position over flame strip
A check is made that no flame is present before an ignition attempt is made.
The presence of flame is continually checked during the run period.
Note:
An unstable flame will cause intermittent problems.
Wait until the temperature at the flow pipe is <60C
Check as the
'Water Circulation Lockout' fault
Unplug
the 8 way
connector from PCB.
Is there continuity
between the
2 black
wires ?
Replace the overheat
thermostat
Remove
connectors
from overheat thermostat.
Is there continuity
across the
terminals
Wiring faulty between the PCB
and the overheat thermostat
Is the flame
detection electrode
un-damaged ?
Is the
electrode gap
between
3 and 4 mm ?
Yes
flashing
on
off
flashing
flashing
flashing
No
Replace PCB
Rectify Wiring
Is the wiring
to the detection
electrode OK ?
Yes
Fig. 46