Accessing Electrical Connections; Removing The Front Cover; Rotating The Control Unit And Opening The Power/Pump Module - Viessmann Vitodens 100-W B1HA 26Vitodens 100-W B1HA 35Vitodens 100-W B1KA 35 Installation And Service Instructions Manual

Control Connections

Accessing Electrical Connections

36
Vitodens 100-W, B1HA series & B1KA Combi Installation/Service

Removing the front cover

1. Loosen retaining screws, screws are captive and do
not need to be fully removed.
2. Remove the front panel.

Rotating the control unit and opening the power/pump module

1. Press in the control retaining tabs.
2. With retaining tabs pressed in rotate the control
forward and down.
3. Release the 4 boiler cover retaining clips and pull
cover off.