Viessmann Vitovalor 300-P Installation And Service Instructions For Contractors page 125

Repairs (gas condensing module)
Draining the fuel cell module on the heating water side
A
Fig. 94
1. If these have not yet been actioned: Set service
mode (see page 75).
Note
The cooling process on the fuel cell module lasts
approximately 90 min.
!
Please note
If this waiting time is not observed,
there is a risk of scalding and damage to the
appliance.
Draining the system on the DHW side
B
Fig. 95
1. Shut off the cold water connection.
(cont.)
B
A
2. Place a shallow container of sufficient size (min.
5 l) below drain port
A
3. Unscrew the filter from drain port
4. Undo screw approx. 1.5 turns.
B
Troubleshooting
.
.
A
125