Viessmann VITODENS 200-W Service Instructions Manual page 84

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
84
F1
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)
Then standard control mode
resumes.