Appendix
0020258610_00 ecoVIT exclusiv Installation and maintenance instructions
33
Message
Possible cause
Measure
F.70 Fault: Invalid Device
Specific Number
Incorrect/missing Device
Specific Number or
incorrect/missing coding resistor
▶
If the display and PCB have been replaced, change the Device
Specific Number under
D.93
.
F.73 Fault: Water press.
sensor
(signal too weak)
Water pressure sensor reports
that the water pressure is too
low
▶
Check: Water pressure, earth connection, cable, plug, water
pressure sensor (short circuit to GDN).
F.74 Fault: Water press.
sensor
(signal too strong)
Water pressure too high
▶
Check: Water pressure (heating side, when heating pump
is not active), drain water if required, cable, water pressure
sensor (short circuit to 24/5 V).
F.82 Fault: Ext. current anode
External current anode de-
fective or not connected (for
actoSTOR
only)
▶
Check: Cable harness, external current anode.
F
Troubleshooting
Symptom
Possible cause
Measure
Not shown in the display
No power supply
▶
Check whether the power supply to the building and the main
switch on the product are switched on.
1.
Switch on the power supply to the building and the main
switch on the product.
Edge connector X1 network
(turquoise) not connected to the
PCB
▶
Check whether there is mains voltage at the edge connector.
1.
Plug edge connector X1 (turquoise) correctly into the PCB.
The fuse on the PCB is defect-
ive
▶
Check the fuse on the PCB in the electronics box.
1.
Replace the fuse.
No response to the control de-
mand
No eBUS connection
▶
Check the connection between the BUS connections in the
control and the product.
1.
Establish the eBUS connection.
The VRT room temperature
control or VRC 450 or VRC 700
control do not detect heat gen-
erator eBUS participants
▶
Check whether the control has detected the heat generator as
an eBUS participant.
1.
Switch the heat generator on and off again so that the control
can detect the eBUS participants again.
The VRC 630 or VRS 620 con-
trols do not detect heat gener-
ator eBUS participants
▶
Check whether the control has detected the heat generator as
an eBUS participant.
1.
Switch the control on and off again so that the control can
read the eBUS participants again.
No response to on/off control
demand
The switching contact for ter-
minals 3 and 4 is not connected
▶
Place a bridge between switching contacts 3 and 4, and check
whether the heat generator starts up.
1.
Check that the external on/off control is working correctly.
No response to the domestic
hot water demand
Incorrect control settings for
domestic hot water generation
1.
Check the control's domestic hot water generation settings.
2.
Check the cylinder charging pump.
3.
Check the cylinder target value settings on the heat generat-
or's control panel.
Cylinder charging pump defect-
ive
▶
Check the cylinder charging pump.
Incorrect cylinder target value
settings in the heat generator
▶
Check the cylinder target value settings on the heat generat-
or's control panel.
