Worcester ZWB 7-25 HE combi Specifications download pdf (Page 28)

7 181 465 346 GB (03.02)

Failure identification procedure

E2 flashing.

The heating outlet NTC sensor is damaged.

Check Action

B Note the setting of the temperature controls

and .

B Press button .

B Select service function .1 .

Is a temperature between 0. and

5. displayed?

yes: The heating outlet NTC sensor is in short circuit:

B Power OFF the appliance.

B Replace CH flow NTC sensor; observe fitting

instructions for NTC sensor when doing so.

B Turn ON the appliance.

E2? ↓2.

no: ↓2.

2. Temperature for heating outlet NTC

sensor between 95. and 99. is dis-

played.

yes: The CH flow NTC sensor is interrupted :

B Power OFF the appliance.

B Replace CH flow NTC sensor; observe fitting

instructions for NTC sensor when doing so.

B Turn ON the appliance.

E2? ↓3.

no: ↓3.

3. Check if the 20-pin connector lead

assembly is damaged.

B Power OFF the appliance.

B Disconnect the boiler electrical connection.

B Change the 20-pin connector lead assembly.

B Reconnect the boiler electrical connection.

B Turn ON the appliance.

E2? ↓4.

4. The PCB control board is damaged. 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.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 55 56

Comments to this Manuals

No comments

Worcester ZWB 7-25 HE combi Specifications Page 28

Comments to this Manuals

Related products and manuals for Water heaters & boilers Worcester ZWB 7-25 HE combi