Technical data

Vitodens 200-W B2HA 19, 28, 35 Service
5683 702 - 07
78
Troubleshooting
Fault Codes (continued)
*1 Control mode: Boiler/burner fully operational (fault code must be verified and reset).
Burner in fault mode: Boiler control requires manual reset before burner can resume operation.
Burner blocked: If fault cause is corrected, burner resumes operation.
Fault code on display System behavior*1 Cause Corrective action
FA Burner in fault mode Fan not at standstill Check the fan, the fan
connecting cables and fan
control. Check the fan control.
Press reset button R.
FC Burner in fault mode Gas valve faulty or faulty
modulation valve control;
or vent system blocked
Check the gas valve.
Check the vent system.
Press reset button R.
FD Burner in a fault state and
additional fault B7 is displayed
Boiler coding card is
missing
Insert the boiler coding card.
Press reset button R.
Replace control unit if fault
persists.
Burner in a fault state Fault, burner control
unit
Check ignition electrodes and
connecting cables. Check
whether a strong interference
(EMC) field exists near the
appliance. Press reset button R.
Replace control unit if fault
persists.
FE Burner in fault mode Damaged or incorrect
boiler coding card or
main PCB
Press reset button R. If the fault
persists, check the boiler coding
card or replace it or the control
unit.
FF Burner in fault mode Internal fault or reset
button R blocked
Restart the equipment.
Replace the control unit if the
equipment will not restart.
No fault code displayed
Fault indicator ON
NOT USED
Burner blocked and 3 displayed
in code 38
Flow rate insufficient,
circulation pump or flow
switch faulty or heat
exchanger blocked
Check pump operation and flow
switch, replace if required flush
and clean heat exchanger.