Manualshelf

Technical data

ManualsBrandsViessmann ManualsBoilerWB2B
51525354555657585960
Troubleshooting
58
Diagnostics
(continued)
Fault codes
(continued)
Fault code on display System behavior
*1
Cause Corrective action
E8 Burner in fault mode The ionization current lies
outside the permissible range
Check the ionization electrode and cable.
Press ” RESET”
E9 Burner in fault mode The ionization current lies
outside the permissible range
during calibration
Check the ionization electrode and cable.
Check venting system for leaks.
Press ” RESET”
EA Burner in fault mode The ionization current lies
outside the permissible range
during calibration
Check the ionization electrode and cable.
Press ” RESET”
Eb Burner blocked Boiler control initiated a
combustion calibration but
could not complete the
process
- Heat generated by boiler must be
removed (boiler is cycling on temperature
limits, before calibration process is
complete)
- Check the connecting cable and the
ionization electrode, check the flue gas
system (flue gas recirculation)
- Verify pump operation
- Switching points of flow switch marginal
(not enough flow)
- Check coding card
- Check gas valve
- Check coding address 82
- Also see address 12:__
Press ” RESET”
EE
Burner in fault mode At burner start, flame signal
is missing or too weak
Check the ionization electrode and cable.
Check gas supply, condensate drain,
ignition and ignition module
Press ” RESET”
EF Burner in fault mode Flame is lost immediately
after it has built (during the
safety time)
Check gas supply, check flue gas/exhaust
pipe/air intake for flue gas recirculation,
check ionization electrode
(replace if necessary)
Press ” RESET”
EC Burner in fault mode The ionization current lies
outside the permissible range
during calibration
Check the ionization electrode and cable.
Press ” RESET”
Ed Burner in fault mode Internal fault Replace the control unit
F0 Burner blocked Internal fault Replace the control unit
F1 Burner in fault mode Maximum flue gas
temperature exceeded
(230ºF / 110ºC)
Check heating system fill
level. Bleed air from system.
Press ” RESET” after vent system has
cooled down
5418 911 v1.6