Benchmark ZWB 7-29 CC1 Installation And Servicing page 78

Failure identification procedure
E9
and
Safety temperature limiter has tripped.
Check
1. Is the heating pressure between 1
and 2 bar?
2. Is the pump blocked?
3. Lead disconnected from safety tem-
perature limiters?
B Power OFF the appliance.
4.
B Unplug the connector from the
cut-off device.
B Measure the NTC electrical resist-
ance.
R = ∞?
30
flashing.
yes:
no:
yes:
no:
yes:
no:
yes:
no:
Action
↓2.
B Top up system.
B Vent appliance.
B Press
, restart the appliance.
E9? ↓2.
B Unblock the pump.
If pump won't start:
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change the pump.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Press
, restart the appliance.
E9? ↓3.
↓3.
B Power OFF the appliance.
B Connect lead.
B Turn ON the appliance.
B Press
, restart the appliance.
E9? ↓4.
↓4.
B Change the over heating cut-off device.
B Connect flue gas safety temperature limiter lead.
B Turn ON the appliance.
B Press
, restart the appliance.
E9? ↓5.
B Connect flue gas safety temperature limiter lead.
B Turn ON the appliance.
↓5.
7 181 465 346 GB (03.02)