Cleaning The Lambda Sensor - HDG Euro 30 Operation Manual

7 Cleaning and servicing the heating system – Procedure
C
LEANING THE LAMBDA SENSOR
Important!
✎
Observe the "Generally applicable safety instructions" in this
section.
1. Allow the fire in the boiler to burn out and cool off.
1
2
3
4
Figure 7/14 - Cleaning the lambda sensor
2. Unscrew the union nut (1) with a pipe wrench.
3. Remove the lambda sensor (2) and the steel washer (3) under it
from the connection nozzle (4) of the flue gas pipe.
Important!
Steel bristles will damage the lambda sensor.
4. Clean the lambda sensor (2) with a vacuum cleaner.
5. Clean out any deposits inside the connection nozzle (4).
Important!
When reinstalling the lambda sensor, make sure its seal is intact.
Use a pipe wrench to tighten the union nut (1). Do not tighten the
lambda sensor excessively. Never tighten the lambda sensor by the
shaft body.
6. Reinstall the lambda sensor (2) in the reverse sequence.
7. Check the lambda sensor (2) for a secure fit.
8. Carefully tighten the lambda sensor (2) with a 22 mm spanner.
✓
The cleaning of the lambda sensor is completed.
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