Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors page 129

Fault messages on the gas condensing...
Control unit System characteristics
message
F.426 Burner in a fault state
F.427 Burner in a fault state
F.428 Control mode
F.429 Control mode
F.430 No integration of automation
modules possible
F.432 Burner blocked if fault occurs
multiple times.
F.433 Burner blocked if fault occurs
multiple times.
F.436 Control mode
F.437 Control mode
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
(cont.)
Cause
Short circuit, external un-
lock signal
Lead break, external un-
lock signal
Short circuit, air mass flow
rate sensor, fan unit
Lead break, air mass flow
rate sensor, fan unit
Communication error,
gateway
Short circuit, fan speed
signal
Lead break, fan speed
signal
Short circuit, flow sensor
Lead break, flow sensor
Short circuit gas pressure
switch on configuration
adaptor EM-EA1 (elec-
tronics module DIO)
Lead break gas pressure
switch on configuration
adaptor EM-EA1 (elec-
tronics module DIO)
Short circuit signal flue
gas damper on configura-
tion adaptor EM-EA1
(electronics module DIO)
Lead break signal flue gas
damper connection on
configuration adaptor EM-
EA1 (electronics module
DIO)
Short circuit, LPG safety
valve (solenoid valve) sig-
nal at EM-EA1 extension
(electronics module DIO)
Lead break, LPG safety
valve (solenoid valve) sig-
nal at EM-EA1 extension
(electronics module DIO)
Deviation, heat generator
flow temperature sensor/
high limit safety cut-out
heat generator
Deviation, ionisation volt-
age signal
Troubleshooting
Measures
Check connection to heat manage-
ment unit.
Reset device.
Check connection to heat manage-
ment unit.
Reset device.
Check power cable and plug-in
connector.
Check power cable and plug-in
connector.
Check gateway module connecting
cable and power supply.
Check ventilation air supply and
clean if necessary. Check fan and
power cable.
Check ventilation air supply and
clean if necessary. Check fan and
power cable.
Check flow sensor.
Check flow sensor.
Check wiring chamber connection
at EM-EA1 (electronics module
DIO) extension.
Check wiring chamber connection
at EM-EA1 (electronics module
DIO) extension.
Check flue gas damper connection
at EM-EA1 (electronics module
DIO) extension.
Check flue gas damper connection
at EM-EA1 (electronics module
DIO) extension.
Check solenoid valve connection
at EM-EA1 (electronics module
DIO) extension.
Check solenoid valve connection
at EM-EA1 (electronics module
DIO) extension.
Check flow temperature sensor/
high limit safety cut-out. See
page 140.
Reset device.
Check ionisation electrode.
Reset device.
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