Viessmann Vitoladens 300-W Service Instructions For Contractors page 75

Wall mounted oil fired condensing boiler for the combustion of low sulphur fuel oil din 51603-el-1 with integral boiler control unit

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Table of Contents

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)

Then standard control mode

resumes.

Troubleshooting

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Vp3b