Technical data

SERVICING AND SPARES

6 720 648 547 (2012/06) 41

11. PCB REMOVAL

To gain access to the PCB:

▶ Remove the five screws shown in the diagram below and remove the

PCB cover.

Fig. 64 PCB access

12. FAN ASSEMBLY

▶ Remove electrical connector from fan.

▶ Remove condensate trap (see page 36).

1. Undo the union connection (A) from the top of the gas valve.

▶ Remove wire clip (B) from air/gas adjustment assembly (C) then pull

gas pipe down.

2. Unscrew two screws (D).

3. Remove fan from boiler.

4. Remove three screws retaining the air/gas adjustment assembly (E).

▶ Reassemble with new fan assuring that seals are correctly fitted.

Fig. 65 Fan assembly removal

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NOTICE: Air/Gas ratio

▶ After re-assembly the combustion must be checked

using the procedure in the section “Setting the air/gas

ratio.”

▶ The setting of the gas ratio must be carried out by a

competent person.

Setting the air/gas ratio must not be attempted unless

the person carrying out the operation is equipped

with a combustion analyser conforming to BS 7927

and is competent in its use.

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