Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors page 131

Fault messages on the gas condensing...
Control unit System characteristics
message
F.463 Burner in a fault state
(cont.)
Cause
Ionisation current too low
during calibration
Troubleshooting
Measures
Check ionisation electrode and
connecting cable. Check plug-in
connection for loose connections.
Heat generator installation
and service instructions
Check flue system or flue gas re-
circulation.
Reset burner.
Note
Deposits on the electrodes indicate
foreign bodies in the combustion
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.
131