Technical data

7 181 465 346 GB (03.02)
18
Failure identification procedure
4. B Unplug 20-pin connector from
PCB.
After max. 60 sec.:
Does the displayed code change
to a value between 0. and 5.?
yes: B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change the 20-pin connector lead assembly.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
↓5.
no: B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
↓5.
5. To return to normal function mode:
B Press buttons and simultaneously.
B Regulate the temperature control and the
temperature control on the previously set
positions.
1) For notes, refer to Appendix
A7 flashing.
Hot water NTC sensor defective
Check Action