Viessmann Vitovalor PT2 E11T Installation And Service Instructions Manual page 121

Fault messages for gas condensing module
Fault number System characteristics
on the display
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.430 Connection of automation
modules not possible
F.431 Visualisation and control via
KNX not possible
F.440 Burner locked out
F.441 Burner locked out
F.442 Burner locked out
F.443 Burner locked out
F.444 Burner locked out
F.445 Burner locked out
F.446 Burner in a fault state
F.447 Burner in a fault state
F.448 Burner in a fault state
F.449 Burner in a fault state
F.450 Burner in a fault state
F.451 Burner in a fault state
(cont.)
Cause
Time synchronisation
failed
Short circuit, external un-
lock signal
Lead break, external un-
lock signal
Communication error,
gateway
Communication error KNX Check KNX module connecting ca-
Short circuit, gas pressure
switch at EM-EA1 exten-
sion
Lead break, gas pressure
switch at EM-EA1 exten-
sion
Short circuit, flue gas
damper signal at EM-EA1
extension
Lead break, flue gas
damper signal at EM-EA1
extension
Short circuit, LPG safety
valve (solenoid valve) sig-
nal at EM-EA1 extension
Lead break, LPG safety
valve (solenoid valve) sig-
nal at EM-EA1 extension
Deviation, heat generator
flow temperature sensor
Deviation, ionisation volt-
age signal
Deviation, ionisation cur-
rent signal
Error in scheduled pro-
gram run monitoring
Error in scheduled pro-
gram run monitoring
Error in scheduled pro-
gram run monitoring
Troubleshooting
Measures
Set the time.
Check connection to the burner
control unit.
Reset burner.
Check connection to the burner
control unit.
Reset burner.
Check gateway module connecting
cable and power supply.
ble and power supply.
Check gas pressure switch con-
nections at EM-EA1 extension.
Check gas pressure switch con-
nections at EM-EA1 extension.
Check flue gas damper connection
at EM-EA1 extension.
Check flue gas damper connection
at EM-EA1 extension.
Check solenoid valve connection
at EM-EA1 extension.
Check solenoid valve connection
at EM-EA1 extension.
Check flow temperature sensor of
heat generator. See page 130.
Check ionisation electrode.
Check ionisation electrode.
Check ignition electrodes and con-
necting cables.
Check ionisation electrode and
connecting cable.
Reset burner.
Check ignition electrodes and con-
necting cables.
Check ionisation electrode and
connecting cable.
Reset burner.
Check ignition electrodes and con-
necting cables.
Check ionisation electrode and
connecting cable.
Reset burner.
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