Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors page 128

Troubleshooting
Fault messages on the gas condensing...
Control unit System characteristics
message
F.401 Burner in a fault state
F.402 Burner in a fault state
F.403 Burner in a fault state
F.404 Burner in a fault state
F.405 Burner in a fault state
F.406 Burner in a fault state
F.407 Burner in a fault state
F.408 Burner in a fault state
F.410 Burner in a fault state
F.415 No current values of exter-
■
nal electricity meters
No power generation in
■
"Economical" and "Ecologi-
cal" operating modes
Note
Power generation possible
only with "Energy manager
OFF" operating mode.
F.416 Burner locked out
F.417 Burner in a fault state
F.418 Burner locked out
F.425 System in control mode, cal-
culation out of operation
128
(cont.)
Cause
Short circuit, ionisation
voltage, signal 2
Lead break, ionisation
voltage, signal 2
Short circuit, dynamic ioni-
sation current, signal 1
Lead break, dynamic ioni-
sation current, signal 1
Short circuit, dynamic ioni-
sation current, signal 2
Lead break, dynamic ioni-
sation current, signal 2
Safety chain
Gas valve monitoring, re-
lay 1 has responded.
Internal error, processor
burner control unit
Communication error CAN
bus
Flue gas temperature sen-
sor incorrectly positioned
Short circuit, 24 V power
supply
Lead break, 24 V power
supply
Time synchronisation
failed
Measures
Check ionisation electrode and
connecting cable.
Reset device.
Check ionisation electrode and
connecting cable.
Reset device.
Check ionisation electrode and
connecting cable.
Reset device.
Check ionisation electrode and
connecting cable.
Reset device.
Check ionisation electrode and
connecting cable.
Reset device.
Check ionisation electrode and
connecting cable.
Reset device.
Check fill level of the heating sys-
tem.
Check circulation pump.
Ventilate system.
Reset device.
Reset device.
Reset device.
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.
Fit flue gas temperature sensor
correctly. See "Repairs".
Check connecting cable and sup-
ply voltage for the burner control
unit.
Reset device.
Check connecting cable and sup-
ply voltage for the burner control
unit.
Reset device.
Set the time. If external time is
used, check parameters 1504 and
508.