en
30
Installation
Indications,
functions and options
Messages
Commissioning
Operation and function
The display is permanently off.
Press the right button
(
✓
) Display illuminated?
Controller has been in
standby, everything OK
The 16 A fuse of the
power unit is blown.
The fuse holder (which
holds the spare fuse)
becomes accessible
when the cover is
removed.The fuse can
then be replaced.
The fuse of the con-
troller is blown. The fuse
holder (which holds the
spare fuse) becomes ac-
cessible when the cover
is removed.The fuse can
then be replaced.
Check the power supply of the controller. Is it
disconnected?
no
yes
no
yes
Status display Excess fluctuates quickly between positive and negative values.
The 5 A fuse of the power unit is blown. The fuse
holder (which holds the spare fuse) becomes accessi-
ble when the cover is removed.The fuse can then be
replaced.
Does the status display indicate an irregular value?
Lightwheel
®
flashes red / green.
Is the message !VBus Sensor unit indicated in the Status / Messages menu?
no
yes
The
error LED of the measuring unit is flashing red?
The
operating LED
of the measuring unit is
flashing red?
no
Check the
VBus
®
ca-
ble from the controller
to the measuring unit /
establish the connection.
yes
no
yes
o.k.
Check / establish power supply of the measuring unit.
Is the message !VBus Power unit indicated in the
Status/Messages menu?
LED of the power unit glows red?
yes
LED of the power unit
glows green?
no
Check the
VBus
®
line
from the controller to
the power unit / estab-
lish the connection.
yes
no
Unlock the thermal cut-out of the power unit and
check the hydraulics:
• Air inside the electric heating?
• Sufficient operating pressure?
• Sufficient flow rate?
yes
o.k.
The power unit is
defective - replace it.
no
Summary of Contents for tubra-eTherm
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