Draining The Boiler On The Heating Water Side; Checking The Outside Temperature Sensor - Viessmann Vitodens 242-F Installation And Service Instructions Manual

Troubleshooting
Maintenance
(cont.)

Draining the boiler on the heating water side

A
Fig. 65
1. Close the shut-off valves on the heating water side. 3. Open drain valve and drain the boiler as much
A
as required.
2. Route hose at drain valve into a suitable con-
A
tainer or drain outlet.

Checking the outside temperature sensor

X3
Fig. 66
101