NOTICE! If the lambda probe is installed in the heat exchanger cover of the boiler, the
plastic bushing is omitted. Moreover, the lambda probe can be cleaned in this position
whilst mounted.
❒ Carefully remove the Lambda probe (1) and plastic bushing (2)
➥ Pay attention to the cables of the Lambda probe!
❒
Carefully remove impurities from the measuring ports with a fine brush and ash
vacuum
➥ Hold the Lambda probe with the tip downwards so that deposits can fall out of
the measuring ports
❒ Check the plastic bushing (2) for dirt and cracks, replace if necessary
➥ IMPORTANT: The seal surface of the plastic bushing must lie flat after
assembly
CAUTION:
▪ Do not clean the Lambda probe with compressed air
▪ Do not use chemical cleaning agents (brake cleaner, etc.)
▪ Careful handling of the Lambda probe, no “tapping” or cleaning with a wire brush
Servicing the system
5
Maintenance work by technicians
Operating Instructions T4e | B1560520_en 63
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