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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
A8 Error - Voltage Check
1. Check the input voltage of the gas valve while burner is turned off .
Multi tester range: DC
— If the voltage is measured: Gas valve relay error (DC 105 – 135 V)
— If the voltage is not measured: Normal
2. If the voltage is measured, replace the control board.
Figure 25
V
A8 Error - Gas Valve Check
1. If fl ame is present when there is not a call for demand, replace the gas valve.
Figure 26
A8 Error - Flame Rod Check
1. Remove fl ame rod and check condition.
2. Reassemble the fl ame rod, turn on the power supply and measure the
current.
Combustion condition
— Multi tester range: µA (Normal : above 2 µA)
— Connect the multi tester between the flame rod wire and the
flame rod in series and measure)
Figure 27
μA
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