Benchmark ZWB 7-29 CC1 Installation And Servicing page 81

EA
and
No flame ionisations signal
Check
5. Natural gas models:
does the building have a supply pres-
sure regulator?
LPG models:
is the flow rate of the gas supply to
the appliance correct?
6. Is the ground connection correct?
7. Two phase net:
Is there a resistor fitted between Pe
and N?
7 181 465 346 GB (03.02)
flashing.
yes:
no:
yes:
no:
yes:
no:
yes:
no:
Failure identification procedure
Action
B Check that it is fitted correctly and functioning
properly and correct if necessary.
B Check supply pressure, inform gas company if
outside correct range.
B Is correct code plug fitted?
B Press
, restart the appliance.
EA? ↓6.
↓6.
↓6.
B Is there enough gas in the supply cylinder?
B Is there air in the supply pipe?
B Is the solenoid valve in the "meter cabinet" open-
ing?
B Is the supply pressure OK? (if the supply pres-
sure is too high, check the pressure regulator in
the "meter cabinet" and on the LPG supply cylin-
der).
B Press
, restart the appliance.
EA? ↓6.
↓7.
B Correct the electrical ground connection.
B Press
, restart the appliance.
EA? ↓7.
↓8.
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Insert a 2 MΩ resistance between the ground
and the N connection.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Press
, restart the appliance.
EA? ↓11.
33