Benchmark ZWB 7-29 CC1 Installation And Servicing page 88

Failure identification procedure
FA
and
Although appliance switches off, flame still detected
Check
5. Check if the 20-pin connector lead
assembly is damaged.
6. The PCB control board is damaged.
40
flashing.
Action
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change the 20-pin connector lead assembly.
B Turn ON the appliance.
B Reconnect the boiler electrical connection.
B Press
, restart the appliance.
FA?
B Power OFF the appliance.
↓6.
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.
7 181 465 346 GB (03.02)