Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual page 110

Compact energy tower with a gas fired condensing boiler as compact model; natural gas and lpg version

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Troubleshooting

Repairs

(cont.)

Checking the fuse in the Vitosolic 100

1. Switch OFF the power.

2. Fit the cover of the Vitosolic 100.

Extension kit for heating circuit with mixer

Checking the rotational direction of

the mixer motor

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.

110

3. Check fuse A.

2. Note the rotational direction of the

mixer motor during its self-test.

Then set the mixer manually to

"Open" again.

Note

The flow temperature sensor must

now capture a higher temperature.

If the temperature falls, either the

motor is turning in the wrong direc-

tion or the mixer set is incorrectly

fitted.

Mixer installation instruc-

tions

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