Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors page 150

Troubleshooting
Repairs
(cont.)
3. Remove plug C from thermocouple
A, undo locking screw B and
remove thermocouple.
4. Insert new thermocouple A right up
to the mark on the sleeve, tighten
locking screw B and insert plug
C.
150
5. Remove the transport brackets
again.