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18.4.2 Removing the fuses

1. Carry out step 18.4.1;

2. Remove the fuses “X” (see Fig. 111)

3. Reassemble in reverse order.

NOTE:FUSE RATING = 2AMP FAST FUSE

Fig. 111

8. To remove the main PCB disconnect all electrical

connections and remove the two screws W5 (see Fig.

110);

Fit the correct EEPROM supplied with the replacement

PCB;

9. Reassemble in reverse order.

6. To remove the display PCB, remove the two screw

W4 and lift the PCB out (see Fig. 109);

7. Reassemble in reverse order;

18.4.3 Connecting the external sensor

Fig. 112

5. Remove all electrical connections from the display PCB

(see Fig. 108);

4. Remove the two screws W3 from the front control

panel and lower the front control panel (see Fig. 107);

1. Access the main PCB as in step 18.4.1;

2. Install the interface PCB supplied in the external

sensot kit on the main PCB (see Fig. 112);

3. Connect the wires between the external sensor

and the interface PCB* (see Fig. 112).

* ENSURE THAT THE WIRES FOR THE EXTERNAL SENSOR

ARE CONNECTED TO THE TERMINALS INDICATED IN FIG. 112.

NOTE:THE WIRES ARE NOT POLARITY SENSITIVE.

MPORTANT!!

O NOT FIT THE EXTERNAL SENSOR IN THE EVENT THAT THE

BOILER IS BEING USED TO HEAT AN INDIRECT HOT WATER

STORAGE CYLINDER

Fig. 110

Fig. 109

Fig. 107

Fig. 108

Ariston Combi A 24 MFFi User Manual

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