Cleaning and maintenance Maintenance (expert)
2.6.5 Cleaning the heat exchanger
Removing the heat exchanger cover
Remove the insulation laid over the heat exchanger
cover.
Fig. 2-36: Insulation
Loosen the wing nuts and remove the heat exchanger
cover.
Fig. 2-37: Heat exchanger cover
Cleaning the top of the heat exchanger
Strip off the ashes on the inner walls with the poker and
remove the fly ash with an ash vacuum, for example.
Fig. 2-38: Heat exchanger
Checking the heat exchanger tubes
Check the heat exchanger tubes and the turbulators
for "tar deposits" (shiny soot).
Fig. 2-39: Heat exchanger tubes
If there are tar deposits in the heat exchanger
tubes, contact customer service immediately. Tar
deposits can have several causes, for example:
• Leak air through the heat exchanger cover or the
lambda probe
• insufficient boiler runtime (start-stop operation)
• too little heat consumption due to incorrect control
system settings
• Usage for an individual room temperature con-
trol but without buffer storage tank in heating
system
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