Viessmann VITODENS 222-F Installation And Service Instructions Manual page 75

Fault messages
(cont.)
Fault number System characteristics
on the display
F.104 Depending on configuration
of EM-EA1 extension (DIO
electronics module)
F.142 Burner in a fault state
F.160 Control mode
F.161 Burner in a fault state
F.162 Burner in a fault state
F.163 Burner in a fault state
F.182 No DHW heating
F.183 No DHW heating
F.184 Burner in a fault state
F.185 Burner in a fault state
F.299 Wrong time
F.342 Burner in a fault state
F.345 Burner locked out
Cause
External fault message in-
put active
Communication error, fan
unit
No communication via
CAN BUS to connected
electronics modules
Data memory access error Turn the appliance off and on
Processor low voltage
Memory access checksum
error
Short circuit, outlet tem-
perature sensor
Lead break, outlet temper-
ature sensor
Short circuit, flow temper-
ature sensor/high limit
safety cut-out
Lead break, flow tempera-
ture sensor/high limit safe-
ty cut-out
Real-time clock fault
Communication error,
burner control unit BCU
Temperature limiter has
responded
Troubleshooting
Measures
Check connected external device.
Check the fan unit connecting ca-
ble.
Reset the appliance.
Check HMU heat management unit
connections.
Reset the appliance.
again.
Reset the appliance.
Turn the appliance off and on
again.
Check the connecting cable.
Reset the appliance.
Turn the appliance off and on
again.
Reset the appliance.
Check outlet temperature sensor
(see page 91).
Check outlet temperature sensor
(see page 91).
Check flow temperature sensor/
high limit safety cut-out (see
page 91).
Reset the appliance.
Check flow temperature sensor/
high limit safety cut-out (see
page 91).
Reset the appliance.
Set the time. Check battery in
HMU heat management unit.
Check the connecting cable to the
BCU burner control unit.
Reset the appliance.
Ensure adequate heat transfer.
75