BoilerFaultCodesBuderus 2L Fault Code
The Buderus 2L fault code means: your boiler is performing a routine check of its internal pump to ensure everything is working correctly before it starts up.. It appears on 1 Buderus model in our database.
Technical description: Appears in the display after waiting approximately 4 minutes during pump check to indicate pump operation status/test
DIY fix possible
Wait at least 4 to 5 minutes for the automated test to finishDo nothing while the code is displayed as the boiler is simply self-diagnosingCheck if the code disappears and the boiler returns to normal operation automatically
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Buderus models that show the 2L fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Buderus 2L fault code information on this page is sourced and cross-checked against the official Buderus service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026