Vaillant VRC 430f Operating And Installation Manual page 20

5 Status and error messages
Mount four new batteries of the same type into the
battery compartment on the reverse side of the
controller PCB.
Fig. 5.2 Inserting the batteries
h Note!
Make sure the polarity is correct (see Fig. 5.2).
Always change all batteries at the same time.
Only use the following battery type: Alka-
line AA/LR6 Battery 1.5 V.
Do not use rechargeable batteries.
Depending on use, the batteries last between
approx. 1 and 1.5 years.
Carefully press the controller onto the wall plinth
until it snaps into place.
The display remains dark
The display remains dark even when you turn or click
one of the dials.
Change all batteries at the controller.
h Note!
The screen is usually switched off to save ener-
gy. This increases the service life of the batter-
ies.
The display and lighting are activated as soon
as you turn or click one of the dials. If the ap-
pliance is not used for more than one minute
the basic display returns and switches off after
approx. 10 minutes.
20
Status and fault messages of the radio receiver unit
green LED on:
red LED on:
red LED flashes briefly: Radio transmission
green LED flashes:
Operating instructions VRC 430f 0020042470_01
everything OK
Error (no communication with
appliance, controller or outdoor
sensor)
the "learning" process was
started via a button (only rele-
vant for replacement parts)