Chaffoteaux & Maury Britony combi 80 Maintenance And Service Manual page 9

FAULT FINDING CHART Part 2
Does the orange LED
light ?
Does the DHW
temperature rise ?
Replace control PCB because orange
LED is deffective
Replace control or driver PCB
Check if an overheat occur or replace
overheat sensor
No
Does the red LED
light 1
Yes
Does overheat contact
close ?
Press the reset button
Replace driver PCB
Replace gas solenoids
Do the gas solendids
energise 1
Yes
Is there a gas pressure
at manifold ?
Yes
Replace electrode assembly
Check the ionization
electrode
Ok
I
Replace driver PC6
I
No
F
I
Wait until the temperature
becomes stable.
Does DHW temperature
rise over 7o"C?
No
Stop water draw off
J
Replace DHW thermistor
Does the heating outlet
pipe temperature we ?
+Y
Replace the DHW heat exchanger
Replace control PCB
Does the orange LED
light ?
+
Yes
Replace the 3 way valve
cvi
hot then rotate the heating control
knob anticlockwise to minimum
Replace control PCB
Does the orange LED
light ?
I
1
No
The boiler is OK
co