Viessmann Vitovalor PT2 E11T Installation And Service Instructions Manual page 108

Troubleshooting
Fault messages for gas condensing module
Fault number System characteristics
on the display
F.97 Function on digital input DI2
at DIO extension is not per-
formed.
F.98 Function on digital input DI3
at DIO extension is not per-
formed.
F.99 Remote control not function-
ing
F.100 Function of connected com-
ponent in emergency mode
F.101 Function of connected com-
ponent in emergency mode
or not functioning
F.102 No connection to internet
F.103 Communication error dis-
played and display appears
red
F.104 Subject to configuration of
EM-EA1 (DIO) extension
F.142 Burner blocked or 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.176 Fuel cell module diverter
valves not functioning
F.182 No DHW heating
F.183 No DHW heating
F.184 Burner in a fault state
108
(cont.)
Cause
DIO extension PCB faulty
DIO extension PCB faulty
Communication error
PlusBus
Voltage error PlusBus
Short circuit or lead break,
PlusBus
No power supply or CAN
bus lead break or missing
terminator
Update active or no power
supply or CAN bus lead
break or missing termina-
tor
External fault message in-
put active
Communication error, fan
unit
Data access error, fan unit Check the fan unit connecting ca-
Internal communication
error, burner control unit
Internal communication
error, burner control unit
Internal communication
error, burner control unit
Stepper motor drive power
supply fault
Short circuit, outlet tem-
perature sensor
Lead break, outlet temper-
ature sensor
Short circuit, flow temper-
ature sensor
Measures
Replace the PCB.
Replace the PCB.
Check PlusBus connection of all
connected components including
remote control unit.
Check the PlusBus connecting ca-
ble.
Check cables/leads and plug-in
connectors.
Check cables/leads and plug-in
connections, replace PCB if neces-
sary.
Wait until update has completed.
Check cables/leads and plug-in
connections, replace PCB if neces-
sary.
Check connected external device.
Check the fan unit connecting ca-
ble.
Reset burner.
ble.
Reset burner.
Check ignition electrodes and con-
necting cables.
Check ionisation electrode and
connecting cable.
Reset burner.
Reset burner.
Check ignition electrodes and con-
necting cables.
Check ionisation electrode and
connecting cable.
Reset burner.
Check the stepper motor connec-
tion cables. Disconnect and recon-
nect plug.
Check the outlet temperature sen-
sor.
Check the outlet temperature sen-
sor.
Check flow temperature sensor on
the burner control unit (see
page 130).
Reset burner.