Technical data

Vitodens 200-W B2HA 19, 28, 35 Service
77
5683 702 - 07
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
EE Burner in a fault mode At burner start, flame
signal is missing or too
weak
Check gas supply (gas pressure
and gas regulator). Check gas
train. Check ionization electrode
and connecting cable.
Check ignition:
- Connecting leads to ignition
module and ignition electrode.
- Ignition electrode gap and
contamination (see page 22).
Check condensate drain.
Press reset button R.
EF Burner in a fault mode Flame is lost immediately
after it has built (during
the safety time)
Check gas supply (gas pressure
and gas regulator). Check flue
gas/ventilation air system for
flue gas recirculation. Check
ionization electrode (replace
if required):
- Distance to burner gauze
assembly (see page 22).
- Contamination of electrode
Press reset button R.
F0 Burner blocked Internal fault Replace the control unit.
F1 Burner in a fault mode Maximum flue gas
temperature exceeded
230º F (110º C) limit.
Check heating system fill level.
Bleed air from system. Check
circulation pump. Check boiler
water temperature sensor and
cable. Press reset button R after
vent system has cooled down.
F2 Burner in fault mode Fixed high limit switch
open (activated)
Check heating system fill
level. Check the circulation
pump. Bleed air from the
system. Check fixed high limit
switch and connecting cables.
Press reset button R.
F3 Burner in fault mode Flame signal already
present at burner start
Check the ionization electrode
and connecting cable.
Press reset button R.
F8 Burner in fault mode Gas valve closes too
late
Check the gas valve.
Check both control wiring/
connections.
Press reset button R.
F9 Burner in fault mode Fan speed too low
during burner start
Check the fan, the fan cables
and power supply. Check the
fan control.
Press reset button R.