Replacement Of Parts - Worcester ZWBR 7-30 R 30 HE PLUS COMBI Service Booklet

Replacement of Parts

5 Replacement of Parts
B Always disconnect the power supply to
the appliance at the mains before carry-
ing out any work on the electrical sys-
tems and components (fuse, circuit
breaker).
B Always turn off the gas cock before car-
rying out any work on components
which carry gas.
B The User should be recommended to have the appli-
ance serviced regularly by a competent person.
B Information on servicing can be found in the installa-
tion instructions for the boiler.
B Use only genuine spare parts.
B Refer to the Spare Parts List when ordering spare
parts.
B Always renew seals and O-rings removed during
servicing or repair work.
B Use only the following types of grease:
– Water valve: Unisilkon L 641 (8 709 918 413)
– Unions: HFt 1 v 5 (8 709 918 010).
Re-assemble in reverse order of removal!
5.1 PCB control board and transformer
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Unplug all connectors from the control box (inc.
keyed plug). Access is gained by removing the cov-
ers).
B Remove text display and unplug connector from the
PCB.
B Remove screw holding power connector earth lead
and remove earth lead.
B Remove two top fixing screws from the control box.
Fig. 7
46
Supplied By www.heating spares.co Tel. 0161 620 6677
B Lower the control box.
B Unscrew earth lead.
B Unscrew four fixing screws from cover plate.
B Prise off cover plate.
B Pull off transformer.
B Remove pcb holder.
B Remove the pcb control board.
Fig. 8
If the Heatronic PCB is replaced:
B Re-enter the service function settings as recorded in
the commissioning record.
If the text display is replaced, the set serv-
i
ice functions will not be altered.
B Re-enter the remaining data (e.g. time, date, pro-
grammed switching points, heating curve, etc.) on
text display.
7 181 465 347 (05.01)