Repairs - Viessmann VITODENS 200-W Service Instructions Manual

Fault codes
(cont.)
Fault Const.
code on
the dis-
play
FE X
FF X

Repairs

Checking the outside temperature sensor (weather-compensa-
ted control unit)
X3
weath.- System char-
comp. acteristics
X Burner blocked
or in a fault
state
X Burner blocked
or in a fault
state
Cause
Strong inter-
ference
(EMC) field
nearby or
faulty main
PCB
Internal fault
or "E
RESET" key
blocked
600
580
560
540
520
500
480
460
440
420
400
-40 -30 -20 -10 0 10 20 30
Outside temperature in °C
1. Pull plug "X3" from the control unit.
Troubleshooting
Measures
Start the equip-
ment again.
Replace the control
unit if the equip-
ment will not
restart
Start the equip-
ment again.
Replace the control
unit if the equip-
ment will not
restart
83