Appendix
27
Message
Possible cause
Measure
Incorrect configuration:
MA2 VWZ
‑
AI
Incorrectly connected
VR 71
module
1.
Connect the
VR 71
module to the appropriate system dia-
gram.
VR70/VR71 combination not
perm.
VR 70
and
VR 71
are connec-
ted in combination
1.
Connect either the
VR 70
or the
VR 71
.
C.2
Faults
Störung
Possible cause
Measure
Display remains dark
Software error
1.
Switch the mains switch on the heat generator that feeds the
controller off and back on again.
No power at the heat generator
1.
Check the power supply of the heat generator that feeds the
controller.
The product is defective
1.
Replace the product.
No changes in the display when
the rotary knob is turned
Software error
1.
Switch the mains switch on the heat generator that feeds the
controller off and back on again.
The product is defective
1.
Replace the product.
No changes in the display
when the selection buttons are
pressed
Software error
1.
Switch the mains switch on the heat generator that feeds the
controller off and back on again.
The product is defective
1.
Replace the product.
Heat generator continues to
heat once the room temperature
has been reached
Incorrect value in the
Room
temp. mod.
or
Zone assign-
ment
function
1.
Set
Thermost.
or
Temp. mod.
in the
Room temp. mod.
function.
2.
In the zone in which the controller is installed, assign the
controller's address in
Zone assignment
.
System remains in hot water
handling mode
Heat generator cannot reach
the max. target flow temperat-
ure
1.
Set a lower value in the
Max.DHW fl.targ.temp.
function.
Only one of several heating
circuits is displayed
Heating circuits inactive
1.
Activate the required heating circuit by defining its functions
in the
Type of circuit
function.
Only one of several zones is
displayed
Heating circuits inactive
1.
Activate the required heating circuit by defining its functions
in the
Type of circuit
function.
Zone deactivated
1.
Activate the required zone by setting the value to
Yes
in the
Zone activated
function.
0020200781_01
VR
C
700/2
Installation instructions
