Repairs - Viessmann Vitodens 333-F Service Instructions Manual

Fault codes
(cont.)
Fault Const. weath.-
code comp.
on the
display
FE X X
FF X X

Repairs

Checking the outside temperature sensor (weather-compen-
sated control unit)
System char- Cause
acteristics
Burner Boiler coding
blocked or in a card or main
fault state PCB faulty
Burner Internal fault
blocked or in a or "E
fault state RESET" key
blocked
1. Pull plug "X3" from the control unit.
Troubleshooting
Measures
Press "E
RESET". Replace
boiler coding card
or control unit if
the fault persists
Start the equip-
ment again. Re-
place the control
unit if the equip-
ment will not re-
start.
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