The present invention relates to a method for operating a gas boiler, with a gas and - air - mixture is fed in a burner arranged in a combustion chamber is ignited and burnt, the ionization current in the flame is detected, the combustion gas passes through a heat exchanger and the exhaust gas is fed to an exhaust gas system. , The present invention provides that the drop in the ionization current during the operation by a predetermined amount, the greater than the operational fluctuations of the ionization current as a characteristic for the insertion of system-related, self-induced oscillations (roaring) is evaluated as a countermeasure, and that then a change in the load and / or air / fuel ratio is carried out, then, the insertion of self-induced oscillations (roaring) is detected and it can be suitable countermeasures for the end of the unstable operation are taken.
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