Repairs - Viessmann VITOLADENS333-F Service Instructions Manual

Troubleshooting
Fault codes
(cont.)
Fault code System character-
on the dis- istics
play
FE Burner blocked
FF Burner blocked

Repairs

Checking the outside temperature sensor (weather-compen-
sated control unit)
74
Cause Measures
Strong interfer- Check boiler coding
ence (EMC) field card, restart the equip-
nearby or boiler ment. Replace the con-
coding card/main trol unit if the equipment
PCB faulty will not restart.
Internal fault Start the equipment
again. Replace the con-
trol unit if the equipment
will not restart.
1. Pull plug "X3" from the control unit.