7 Service and troubleshooting
28 Operating instructions VRT 350 0020135485_00
7 Service and troubleshooting
7.1 Cleaning the controller
1. Clean the casing of the controller with a damp cloth.
2. Never use scouring or cleaning agents which could
damage the operator control elements or the display.
7.2 Detecting and rectifying faults
Fault Cause Remedy
Display is dark Unit fault – Switch off the
mains switch
on the heater
for approx. 1
minute and
then switch it
on again
– If the error is
still present,
inform the com-
petent person
No changes in the
display via the
rotary knob
No changes in the
display via the
selector buttons
Table 7.1: Detecting and rectifying faults
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