F Troubleshooting - Vaillant ecoVIT exclusiv Installation And Maintenance Instructions Manual

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