Diagnosis And Correction - Viessmann VITOTRONIC 300 GW2 Operating Instructions And User's Information Manual

Diagnosis and correction

DFault
Tu
Boiler sensor
U
Acknowledge? Yes
If a fault occurs on the heating system, it will be indicated in the display
window and by the flashing red fault indicator (see page 5).
Using the scan facility, you can read off the fault code yourself and inform your
°C
heating contractor accordingly.
1. Open the hinged cover on the
programming unit.
Press
2.
The error source is
displayed in plain language
and in the form of a fault
code.
Press
3.
changes to "Acknowledge?
Yes".
/ Press
4.
"No".
Press
5.
the display changes and
shows the boiler
temperature.
6. Close the hinged cover on the
programming unit.
To call up an acknowledged fault message
Press
1.
approximately 2 seconds.
/ Press
2.
further faults.
for fault search.
Example
U U U U
or
Press "Acknowledge?" to confirm
; the display
that you have noted the fault.
Please note:
The fault message will re-appear at
07:00 hrs on the following day if the
/ for "Yes" or
fault is not corrected in the
meantime.
The red fault lamp continues to
to confirm;
flash until the fault has been
corrected.
for
The fault is displayed.
/ to display
Only if two or more faults have
occurred.
Troubleshooting guide
Fault display
Error number
Sensor designation
plug designation
Open circuit
Short circuit
27