Worcester 28CDI Manual de Serviço descarregar pdf (Página 36)

36

Remove multiway

connector from board

position ST16. Test

resistance across

contacts 17 and 18

(yellow wires). Is it

between 1 kohm and

30 kohm?

Test resistance across

contacts 12 and 13

(red wires). Is it

between 1 kohm and

30 kohm?

Test resistance across

contacts 7 and 8

(brown wires) and 9

and 10 (violet wires).

Are both readings

below 100 ohms?

Replace control board.

(Section 16.4.23).

Replace gas valve.

(Section 16.4.11).

Remove both brown

connectors from gas

valve. (First remove

pressure switch

bracket). Is there

continuity from

brown and violet

wires to the multiway

connector?

Check or replace CH

sensor.

(Section 16.4.12).

Is there continuity

from contacts 17 and

18 to DHW sensor?

Check or replace

DHW sensor.

(Section 16.4.13).

Is there continuity

from contacts 12 and

13 to CH sensor?

Repair or replace

harness.

Repair or replace

harness.

Repair or replace

harness.

Is the multiway

connector at board

position ST16 pushed

fully home on to the

board?

Push fully home.

FAIL POINT I “Sensor Fault”

No

No

No

No

No

No

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

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