9
F
A
UL
T FINDING CHAR
T P
ar
t 2
Does the orange
LED alight ?
Replace gas solenoïds
assembly
Replace electrod
assembly
Does overheat con
-
tact close ?
Does the red LED
alight ?
Does the burner
alight more than 8 sec.?
Check if an overheat occur or
replace overheat sensor
Replace control PCB because
orange LED is deffective
Purge gas pipes and press on
reset button
Does gas solenoïds
energized ?
Is there a gas
pressure at manifold ?
Does the heating
outlet pipe temperature
rise ?
check the ionization
electrod
Does DHW
temperature over 70
°C ?
Check DHW
thermistor
Does the heating
outlet pipe
temperature rise ?
Does the orange
LED alight ?
Does the orange
LED alight ?
Replace control
PCB
Replace DHW thermistor
Replace the 3 way valve
Replace the 3 way valve
Replace control PCB
Stop water draw off
Wait until the return pipe
becomes hot, then rotate the
heating control knock anticlock
-
wise to minimum.
- Adjust the DHW fl
ow rate to
3 l/min. on a tap.
- Wait until the temperature
becomes stable.
Put the selector switch on
I
position.
- Press on RESET button to cancel the 3 min.
delay.
- Ensure that external controls are calling for
heat.
- Rotate heating knob clockwise to the maximum
position.
Yes
The boiler is OK
Yes
No
Yes
Yes
No
No
Ok
No
No
No
Yes
Yes
No
No
No
No
Does the DHW
temperature rise ?
No
Yes
Yes
No
Ok
Replace the DHW heat
exchanger
Yes
Yes
Yes
Yes
Replace control PCB
Replace PCB
Replace PCB
No