Service And Troubleshooting; Cleaning The Controller; Detecting And Rectifying Faults - Vaillant VRT 350 Operating Instructions Manual

6 Service and troubleshooting

Caution.
Risk of damage to the heating installation
due to failure to perform troubleshooting
work.
A fault message indicates that the skilled
tradesman must perform troubleshooting or
repair work on the heating installation. Failure
to observe these fault messages could lead to
material damage or failure of the heating in-
stallation.
▶ If the controller displays a fault message,
inform a skilled tradesman.
!
Heat generator 1 fault
Back
If the controller shows a fault message in the display instead
of the basic display and you press the left-hand selection
button Back then the basic display appears again.
You can also read current fault messages under Menu → In-
formation → System status → Status. As soon as a fault
32
message for the heating installation appears, the Status set-
ting level will display Fault. In this case, the right-hand func-
tion key has the function Display.
6 Service and troubleshooting
6.1

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.
6.2

Detecting and rectifying faults

Fault Cause
Display is dark Unit fault
No changes in
the display via the
rotary knob
No changes in the
display via the se-
lector buttons
Operating instructions VRT 350 0020135485_01
Remedy
–
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
competent person