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4.3.2. GAS alarm: F4: flame missing
The diagram shows an ignition cycle where there is no detection of flame. During the cycle
you have 3 ignition attempts (spark), each one preceded by purging of the combustion
chamber (necessary for removing from the combustion chamber the gas released
previously).
After these 3 attempts the combustion control board goes into state "8” the combustion is
blocked and the display shows the alarm GAS: F4. The alarm can be reset by the user.
The causes may be different, for details please refer to section 4.8 Gas Alarms.
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