Viessmann Cascade control unit Installation, Operating And Service Instructions page 31

Safety and monitoring equipment
Fault messages
In the event of a fault recognised by the control unit (e.g. faulty sensor), the
status display will show "Status display fault", and the fault indicator "U"
illuminates.
The "Fault" menu has the following functions:
H List of all current faults
H Date and time of last change in fault situation
H List of the last 10 faults
(1: most recent fault; 10: oldest fault in the memory)
H Deletion of all faults from memory
Multi-boiler control unit
Status display
fault
Operating details
Fault
Faults
Flow temp.
Tu 29 10 2002
08:15:00
Saved fault 01
Flow temp.
Fault memory
Clear
The system records a fault.
The system records a fault.
Example:
There is a fault in the flow temperature sensor
area.
Date and time of the last change in the fault
situation.
The last 10 faults are shown in sequence. The
second line lists the fault details.
To delete the last 10 faults, select "Yes".
Yes
(cont.)
Functions
31