Ensure boiler main
ON/OFF control is set
to position "1"
Is there a display on
the LCD Panel?
Yes Go to sheet C
Check electrical supply, appliance fuses and on/off control
No
Is 230VAC present across
terminals L and N?
Yes
Is 230VAC present across
terminals 3 and 5?
Yes
Is voltage between
16-26 VDC present across
terminals 8 and 9?
Yes
Is 5 VDC present between
5V and GND test points
on electronic board?
Replace LCD display
Yes
NoRepair external fault
Is the continuity
across fuse F1?
Go to sheet B
Does ON/OFF knob
operate switch on
electronic board
Boiler ON/OFF control
defective,
change electronic
board
Replace switch
mechanism
No
No
No
Yes
Yes
Note 1:
For test purposes, disconnect
external controls from terminal
3 - 4 and replace with a bridge
between these terminals.
It appliance then operates, the
fault is with the external controls.
Sheet A
Is there continuity
across fuse F3?
No
No
Replace electronic
board
No
Check transformer
Replace if
necessary
Yes
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