Benchmark ZWB 7-29 CC1 Installation And Servicing page 85

F0
(and possibly
Internal failure
Check
1.
B Press buttons
neously.
B Select service function 9.3 .
A service code is displayed.
B Select service function 5.2 .
2.
A service code is displayed.
3.
flashing?
4. The PCB control board is damaged.
7 181 465 346 GB (03.02)
) flashing.
and simulta-
yes:
no:
Failure identification procedure
Action
B Note the setting of the temperature controls
and .
B Enter figure displayed in customer service record.
↓2.
B Enter figure displayed in customer service record.
↓3.
B Press button
.
B Initiate demand for heat by pressing
and then press again after 30 seconds to cancel.
B Initiate two more demands for heat as above.
F0? ↓4.
↓4.
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.
To return to normal function mode:
B Press buttons
and
B Regulate the temperature control
temperature control
positions.
button
simultaneously.
and the
on the previously set
37