Worcester ZWB 7-25 HE combi Specifications download pdf (Page 17)

7 181 465 346 GB (03.02)

Failure identification procedure

A7 flashing.

Hot water NTC sensor defective

Check Action

B Note the setting of the temperature controls

and .

B Press button .

B Select service function .2 .

Is a temperature between 0. and

5. displayed?

yes:

B Flue gas connector corroded

, damaged or

dirty? Change relative parts.

↓2.

no: ↓3.

2. Hot water NTC sensor:

B Unplug connector.

B Short circuit the connector.

Display changes to

temperature 99.

yes: B Power OFF the appliance.

B Drain the hot water circuit.

B Disconnect the boiler electrical connection.

B Change NTC sensor.

B Plug the connection wire.

B Reconnect the boiler electrical connection.

B Turn ON the appliance.

A7? ↓3.

no: B Change the 20-pin connector lead assembly.

↓3.

3. Temperature between 95. and 99. is

displayed.

B Unplug connector.

After max. 60 sec.:

Does the displayed code change

to a value between 0. and 5.?

yes: B Power OFF the appliance.

B Disconnect the boiler electrical connection.

B Change NTC sensor.

B Refill the hot water circuit.

B Check the built-in NTC sensor for leaks.

B Plug the connection wire.

B Reconnect the boiler electrical connection.

B Turn ON the appliance.

A7? ↓4.

no: ↓4.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 55 56

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Worcester ZWB 7-25 HE combi Specifications Page 17

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