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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
7.11 Electrode
Part No.
7738007260
Function
To ignite the gas, discharge the spark to the main burner repeatedly until
igniting the gas.
Failure Event
Unable to ignite during the ignition process.
Effects
The unit cannot ignite during the ignition process and “A6” error code
will be shown on the display panel.
No effects on the unit, however, the durability of the spark plug are
down.
Error Code
A6
Diagnostic
Visual inspection: Connection or breakage of wires.
Color/Number of Wires
N/A
Ignitor Gap Distance
4.0 – 4.8 mm (0.16“ – 0.19”)
Table 14
7.12 Flame Rod
Part No.
7738007259
Function
Detect the normal fl ame during the combustion.
Failure Event
Fail to detect a flame in spite of the combustion process.
Improper gap
Effects
The boiler is not operated.
Error Code
A6, A8
Diagnostic
Visual inspection: Connection or breakage of wires, check the flame
rod gap.
Check range of voltage shown below.
Color/Number of Wires
White-Ground : AC 24 V
Table 15
7.13 Ignition Transformer & Wire
Part No.
7738007252
Function
To ignite the gas, discharge the high voltage spark to the main burner.
Failure Event
Unable to ignite during the ignition process.
Effects
The unit cannot ignite during the ignition process and “A6” error code will
be shown on the display panel.
Error Code
A6
Diagnostic
Visual inspection: Connection or breakage of wires.
Check range of voltage shown below.
Color/Number of Wires
Brown-Brown: AC 120 V
Input Voltage
120 V, 60 Hz
Output Voltage
18 kV
Table 16
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