Viessmann VITODENS 200 WB2 Series Operating Instructions & User's Information Manual page 31

Diagnosis and Correction
Fault
"Please change batteries" appears in
display window
or
Display window fails to illuminate
(continued)
Cause
Batteries discharged
Troubleshooting Guide
Corrective Action
1. Switch off heating system on/off
switch on the control unit as well
as line voltage.
2. Remove the programming unit.
3. Remove battery compartment
from rear panel.
4. Change batteries.
Use alkaline batteries (AAA).
IMPORTANT
Insert batteries as illustrated.
5. Insert battery compartment into
rear panel.
Snap programming unit back into
place.
6. Switch on heating system on/off
switch and line voltage.
IMPORTANT
Please be sure to dispose discharged
batteries in an environmentally sound
manner. Please inquire at local recycl-
ing facilities about public
recycling programs available.
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