Repairs - Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual

Fault codes
(cont.)
Fault code System character-
on the dis- istics
play
FE Burner blocked or in
a fault state
FF Burner blocked or in
a fault state

Repairs

Checking the outside temperature sensor
Cause Measures
Strong interfer- Start the equipment
ence (EMC) field again. Replace the con-
nearby, or faulty trol unit, if the equip-
main PCB ment will not restart.
Internal fault or Start the equipment
"E RESET" key again. Replace the con-
blocked trol unit, if the equip-
ment will not restart.
1. Pull plug "X3" from the control unit.
Troubleshooting
99