Error code Description
Error in communication with SU PCB:
Bad connection: check whether the SU PCB has been correctly fitted in the connector on the PCU
PCB
Communication error with the SCU PCB:
Bad connection: check the wiring
Faulty SCU PCB: replace SCU PCB
Blocking input in locked-out mode:
Bad connection: check the wiring
External cause: remove external cause
Wrong parameter set: check the parameters
If present: Heat recovery unit test fault:
Bad connection: check the wiring
External cause: remove external cause
Wrong parameter set: check the parameters
11.2
Error memory
The boiler control unit has an error memory. It stores the last 16 errors that
have occurred.
In addition to the error codes, the following data is also saved:
Number of times that the error occurred: ( ).
Boiler operating mode ( ).
The flow temperature ( ) and the return temperature ( )
when the error occurred.
To view the error memory, you must first enter the access code .
11 Troubleshooting
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