Method for detecting a flow restriction in the combustion air flow path and / or in the exhaust gas flow path of a fuel-operated heater, in particular for a vehicle

摘要

A method of detecting a flow restriction in the combustion air flow path (20) and / or the exhaust gas flow path (24) of a fuel-fired heater (10), the heater (10) comprising a combustion air supply assembly (18) having an electrically powered drive motor (28) The following measures include: a) in association with a desired heating power of the heater (10), predetermining a nominal electrical power consumption (P1, P2, P3) for the drive motor (28) and an allowable deviation range (S1, S2, S3) the desired power consumption (P1, P2, P3), b) checking whether a comparative power consumption (PV) representing the electric power consumption (P) of the drive motor (28) is within the allowable deviation range (S1, S2, S3), c ), when the comparison power consumption (PV) is not within the allowable deviation range (S1, S2, S3), generating the presence of a damming state in dizierender information.