
6 Service and troubleshooting
36
Operating instructions VRT 350f 0020131979_00
Fault
Cause
Remedy
Display is dark
Appliance fault
–
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
No changes in the
display via the
rotary knob
No changes in the
display via the
selection buttons
6.3
Changing batteries
1
2
1
Control
2 Wall-mounting base
1.
Pull the controller
(1)
upwards and off the wall-mounting
base
(2)
.