Heat Store Ntc Sensor 2 Defective - Worcester ZSBR 7-28 ICS1 Service Booklet

Rectifying faults
A5
flashing.

Heat store NTC sensor 2 defective

Check
B Activate menu option
1.
Show service parameters.
B Select
.4 Stor.tank temp.sensor2 .
Is a temperature between 0. and 5.
displayed?
B Disconnect connector for heat
2.
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.?
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.?
B Unplug the 20-pin connector lead
4.
assembly from the Heatronic.
After max. 60 sec.:
Does the displayed code change
to a value between 0. and 5.?
1) For notes, refer to Appendix.
18
Action
B Is the connector for heat store NTC sensor 2 cor-
yes:
1)
roded , damaged or dirty? Replace affected
components.
↓2.
↓3.
no:
B Power OFF the appliance.
yes:
B Change heat store NTC sensor 2.
B Plug the connection wire.
B Turn ON the appliance.
A7? ↓3.
B Change the 20-pin connector lead assembly.
no:
↓3.
B Power OFF the appliance.
yes:
B Change heat store NTC sensor 2.
B Plug the connection wire.
B Turn ON the appliance.
A7? ↓4.
↓4.
no:
B Change the 20-pin connector lead assembly.
yes:
B Power OFF the appliance.
no:
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
7 181 465 347 (01.07)