Worcester ZWB 7-25 HE combi Specifications download pdf (Page 22)

7 181 465 346 GB (03.02)

Failure identification procedure

Ad flashing.

Heat store NTC sensor 1 not detected (ZB...).

Check Action

B Note the setting of the temperature controls

and .

1. Is connecting lead for heat store

NTC sensor 1 correctly routed, i.e.

not through cable grommet?

yes: ↓2.

no: B Route connecting lead for heat store tempera-

ture sensor as specified in installation instruc-

tions.

B Press button .

B Select service function .3 .

Is a temperature between 0. and

5. displayed?

yes: Is NTC sensor connector corroded, damaged or

dirty?

B Power OFF the appliance.

B Change NTC sensor.

B Turn ON the appliance.

B Press button .

Ad? ↓3.

no: ↓4.

3. Heat store -NTC 1:

B Unplug connector from PCB con-

trol board.

B Short circuit the connector using

wire jumper.

After max. 60 sec:

Display changes to temperature

between 99. and 95.

yes: B Power OFF the appliance.

B Change NTC sensor.

B Turn ON the appliance.

B Press button .

↓4.

no: B Make a note of the altered service settings (see

table 1, "First Service Level; Values that can be

modified" at page 8 and table 5, "Secondary

Service Level; Values that can be modified" at

page 11).

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.

B Restore service settings previously noted down.

↓4.

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Worcester ZWB 7-25 HE combi Specifications Page 22

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