Viessmann LB1 - Page 43

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E0 Battery
Cause Measure
If the ventilation unit is isolated from the power supply,
the time must be reset.
Change the batteries in the programming unit.
If the fault recurs, replace the programming unit.
E1 Internal memory
Cause Measure
Internal programming unit fault Restart the programming unit.
If the fault recurs, replace the programming unit.
E2 RTC fault
Cause Measure
Internal programming unit fault Replace the programming unit.
E3 External memory
Cause Measure
Internal programming unit fault Restart the programming unit.
If the fault recurs, replace the programming unit.
E4 Internal memory
Cause Measure
Internal programming unit fault Restart the programming unit.
If the fault recurs, replace the programming unit.
FF Communicatn disrupted
■
Ventilation unit continues to run with the last values
specified.
or
■
"Background vent." is switched on.
Cause Measure
No communication with ventilation unit e.g. if wrong
type is set at "Enable Vitovent 7D00".
■
Check the ventilation unit and connecting cable. Re-
place ventilation unit control PCB if necessary.
■
Check parameter setting "Enable Vitovent 7D00".
Correct setting if required.
■
Replace the programming unit.
Message list Vitovent 300-C/300-W
03 Filter change
Ventilation unit remains operational, increased electri-
cal power consumption.
Troubleshooting
Message list Vitovent 200-C (cont.)
5816558
Diagnosis