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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
9.8 Gas Valve
1. Refer to 9.1 Preparation Step.
2. Disconnect the wire from the gas valve (Item 1).
3. Loosen the nut connecting the gas valve and the gas inlet & outlet using a
wrench (Item 2).
Figure 96
1
2
2
4. Replace with a new gas valve, and when assembling the gas inlet & outlet nut,
insert the packing.
5. Connect the wire (Item 1).
9.9 High Limit Cutout HEX T2 (302°F)
1. Refer to 9.1 Preparation Step.
2. Disconnect the wire from the high limit cutout (Item 1).
3. Loosen the 2 high limit cutout fi xing screws (Item 2).
Figure 97
1
2
4. Replace with a new high limit cutout and tighten the 2 fi xing screws.
5. Connect the wires to the high limit cutout. (Connect 13+21 pin wire to one
terminal and the high limit cutout wire to the other terminal). Make sure to
connect the wires completely.
9.10 High Limit Cutout Supply T3 (203°F)
1. Refer to 9.1 Preparation Step.
2. Disconnect the wire from the high limit cutout (Item 2).
3. Loosen the 1 high limit cutout fi xing screw. (Item 3).
Figure 98
1
2
4. Remove the high limit cutout bracket, replace the high limit cutout with a new
one, and tighten the fi xing screw.
5. Connect the wires to the high limit cutout. (Connect 13+21 pin wire to one
terminal and the high limit cutout wire to the other terminal). Make sure to
connect the wires completely.
9.11 Ignition Transformer
1. Refer to 9.1 Preparation Step.
2. Disconnect the wires from the electrode (Item 1).
3. Separate the wires from the ignition transformer connection terminal (Item
2).
4. Loosen the 1 ignition transformer fi xing screw (Item 3).
Figure 99
1
2
3
5. Replace with a new ignition transformer and tighten the 1 fi xing screw.
6. Connect the wire to the ignition transformer and electrode. Make sure to
connect the wires to the terminal completely.
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