Viessmann VITOLIGNO 300-P Service Instructions Manual page 104

Troubleshooting
Repairs
(cont.)
Extension kit for heating circuit with mixer, part no. 7267 627
Components:
■ Mixer motor with 4.2 m long connect-
ing cable
■ Plug for connecting the heating circuit
pump
■ Flow temperature sensor (contact
temperature sensor)
Mixer motor, part no. 7450 657
Checking rotational direction
The mixer is opened and closed using
the control unit actuator test (see
page 39).
Note the rotational direction of the mixer
motor during the actuator test.
Note
The flow temperature sensor must now
capture a higher temperature. If the tem-
perature drops, either the motor is turn-
ing in the wrong direction or the mixer
insert is incorrectly fitted.
104
Flow temperature sensor
See contact temperature sensor,
page 98.
Mixer installation instructions