Viessmann VITOLADENS333-F Service Instructions Manual page 79

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
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)
Troubleshooting
79