Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors page 133

Fault messages on the gas condensing...
Control unit System characteristics
message
F.468 Burner in a fault state
F.471 No heat demand
F.472 Control mode without elec-
tricity meter data
F.473 No heat demand
F.474 Burner in a fault state
F.475/42F1 No power generation
F.517 Control mode, remote control
unit not functioning
F.523/18F0 No power generation
(cont.)
Cause
Ionisation current too high
during calibration
System pressure sensor
not available
Communication error,
electricity meter
Heat management unit
communication error
Error in scheduled pro-
gram run monitoring
Air in the system separa-
tion circuit or system sep-
aration circuit not filled
Communication error,
Vitotrol wired remote con-
trol
Fault, reformer burner ig-
nition
Troubleshooting
Measures
Check gap between ionisation
electrode and burner gauze as-
sembly. See page 79.
Heat generator installation
and service instructions
Check whether there is a lot of
dust in the ventilation air (e.g. from
construction work).
Note
Deposits on the electrodes indicate
foreign bodies in the ventilation air.
Check the installation room and
flue system for causes of the de-
posits. For example: Laundry de-
tergents, cleaning agents, toilet-
ries, deposits in the ventilation air
supply (chimney).
If burner gauze assembly and ioni-
sation electrode have been re-
placed, also clean fan unit, gas/air
channel and Venturi extension.
Reset device.
Check system pressure sensor.
Check CAN bus connection to
■
the external electricity meter (ob-
serve polarity and correct if nec-
essary).
Check setting of CAN bus termi-
■
nator switch: See page 48.
Disconnect electricity meter from
■
power supply then reconnect.
Check connecting cable between
burner control unit and heat man-
agement unit.
Reset device.
Fill and vent the system separation
circuit.
Note
The message can only be cleared
on the programming unit of the fuel
cell module.
Check remote control unit connect-
ing cable and setting.
Reset the fault once.
If the fault recurs, notify Viessmann
Technical Service.
133