Viessmann VITODENS 222-F Installation And Service Instructions Manual page 83

Fault messages
(cont.)
Fault number System characteristics
on the display
F.400 Burner in a fault state
F.401 Burner in a fault state
F.402 Burner in a fault state
F.403 Burner in a fault state
F.404 Burner in a fault state
F.405 Burner in a fault state
F.406 Burner in a fault state
F.407 Burner in a fault state
F.408 Burner in a fault state
F.410 Burner in a fault state
F.416 Burner locked out
F.417 Burner in a fault state
F.418 Burner locked out
F.425 System in control mode, cal-
culation out of operation
F.426 Burner in a fault state
F.427 Burner in a fault state
F.428 Control mode
F.429 Control mode
Cause
Lead break, ionisation
voltage, signal 1
Short circuit, ionisation
voltage, signal 2
Lead break, ionisation
voltage, signal 2
Short circuit, dynamic ioni-
sation current, signal 1
Lead break, dynamic ioni-
sation current, signal 1
Short circuit, dynamic ioni-
sation current, signal 2
Lead break, dynamic ioni-
sation current, signal 2
Safety chain
Gas valve monitoring re-
lay 1 has responded.
Internal error, processor,
BCU burner control unit
Flue gas temperature sen-
sor incorrectly positioned
Short circuit, 24 V power
supply
Lead break, 24 V supply
voltage
Time synchronisation
failed.
Short circuit, external un-
lock signal
Lead break, external un-
lock signal
Short circuit, air mass
sensor, fan unit
Lead break, air mass sen-
sor, fan unit
Troubleshooting
Measures
Check ionisation electrode and
connecting cable.
Reset the appliance.
Check ionisation electrode and
connecting cable.
Reset the appliance.
Check ionisation electrode and
connecting cable.
Reset the appliance.
Check ionisation electrode and
connecting cable.
Reset the appliance.
Check ionisation electrode and
connecting cable.
Reset the appliance.
Check ionisation electrode and
connecting cable.
Reset the appliance.
Check ionisation electrode and
connecting cable.
Reset the appliance.
Check heating system fill level.
Check circulation pump.
Vent the system.
Reset the appliance.
Reset the appliance.
Reset the appliance.
Fit flue gas temperature sensor
correctly. See "Repairs".
Check connecting cable and sup-
ply voltage to the BCU burner con-
trol unit.
Reset the appliance.
Check connecting cable and sup-
ply voltage to the BCU burner con-
trol unit.
Reset the appliance.
Set the time. If external time is
used, check parameters 1504 and
508.
Check the connection to the HMU
heat management unit.
Reset the appliance.
Check the connection to the HMU
heat management unit.
Reset the appliance.
Check connecting cable and plug-
in connector.
Check connecting cable and plug-
in connector.
83