Viessmann VITODENS 333-F WS3A Service Instructions Manual page 88

Troubleshooting
Repairs
(cont.)
Checking the fuse
1. Switch OFF the power.
2. Release the side closures and
pivot the control unit down.
Extension kit for heating circuit with mixer
Checking the rotational direction of the mixer motor
88
3. Remove cover A.
4. Check fuse F1 (see connection and
wiring diagram).
1. Switch ON/OFF switch A at the
extension kit first OFF and then ON
again. The device will carry out the
following self-test:
Mixer "Close" (150 s)
Pump "ON" (10 s)
Mixer "Open" (10 s)
Mixer "Close" (10 s)