Method for combustion control in a gas or oil burner

The invention relates to a method for combustion control in a gas or oil burner with variable firing power (A, B, C), in which an ionisation value (5, 6, 7) is determined at a distance d from a combustion surface of the gas and oil burner, using an ionisation electrode. The problem solved by the invention is that of identifying a change in the distance between the ionisation electrode and the combustion surface and particularly taking this into account during the combustion control process. The claimed method is characterised in that at least one first ionisation value (5) is recorded at a first firing power (A), and one second ionisation value (6) is recorded at a second firing power (B) which corresponds to an average firing power, said first ionisation value (5) and second ionisation value (6) being compared to one another.