Changing Batteries - Vaillant VRT 350f Operating Instructions Manual

6 Service and troubleshooting
Fault Cause
Display is dark Appliance fault
No changes in the
display via the
rotary knob
No changes in the
display via the
selection buttons
36
6.3
Remedy
– Switch off the
mains switch on
the heat gener-
ator for approx.
1 minute and
then switch it
on again
– If the fault is
still present,
inform the com-
petent person
1 Control
1. Pull the controller (1) upwards and off the wall-mounting
base (2).

Changing batteries

2 Wall-mounting base
Operating instructions VRT 350f 0020131979_00
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