Worcester GREENSTAR HE combi Series, Installation And Servicing Instructions

Page: 142 / 176

7 181 465 347 (01.07)
18
Rectifying faults
A 5
flashing.
Heat store NTC sensor 2 defective
Check Action
1.
B
Activate menu option
Show service parameters .
B Select
.4 Stor.tank temp.sensor2
.
Is a temperature between
0.
and
5.
displayed?
yes:
B
Is the connector for heat store NTC sensor 2 cor-
roded
1)
, damaged or dirty? Replace affected
components.
↓
2.
1) For notes, refer to Appendix.
no:
↓
3.
2.
B
Disconnect connector for heat
store NTC sensor 2.
B Short-circuit the 2-pin connector
on the end of the 20-pin connector
lead assembly.
After max. 60 sec:
Display changes to temperature
between
100.
and
95.
?
yes:
B
Power OFF the appliance.
B Change heat store NTC sensor 2.
B
Plug the connection wire.
B Turn ON the appliance.
A7?
↓
3.
no: B Change the 20-pin connector lead assembly.
↓
3.
3. Temperature between 95 . and 100. is
displayed.
B
Unplug the connector.
After max. 60 sec.:
Does the displayed code change
to a value between
0. and 5. ?
yes: B Power OFF the appliance.
B
Change heat store NTC sensor 2.
B Plug the connection wire.
B
Turn ON the appliance.
A7?
↓
4.
no:
↓
4.
4.
B
Unplug the 20-pin connector lead
assembly from the Heatronic.
After max. 60 sec.:
Does the displayed code change
to a value between
0. and 5. ?
yes:
B
Change the 20-pin connector lead assembly.
no:
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.