Checking The Fuse; Mixer Extension Kit - Viessmann Vitoladens 300-C Installation And Service Instructions Manual

Troubleshooting
Repairs
(cont.)

Checking the fuse

Fig. 63

Mixer extension kit

Checking the setting of rotary selector S1
The rotary selector on the PCB of the extension kit
defines the assignment to the relevant heating circuit.
Heating circuit
Heating circuit with mixer M2
(heating circuit 2)
Heating circuit with mixer M3
(heating circuit 3)
Checking the rotational direction of the mixer
motor
After being switched on, the boiler implements a self-
test. During this, the mixer is opened and closed again.
88
1. Switch off the power supply.
2. Remove top panel
3. Remove cover
4. Check fuse F1 (see connection and wiring dia-
F1
Note
The mixer motor can also be started via the actuator
test (see chapter "Checking outputs").
Observe the rotational direction of the mixer motor dur-
ing its self-test.
Rotary selector S1
Then manually set the mixer back to "Open".
setting
The flow temperature sensor must now capture a
2
higher temperature. If the temperature drops, either
the motor is turning in the wrong direction or the mixer
4
insert is incorrectly fitted.
.
A
.
B
gram).
Mixer installation instructions