Vaillant VR 92/2 Manual De Uso E Instalación página 30

B -- Troubleshooting, maintenance message
B.1 Troubleshooting
Symptom
Display remains dark
No changes in the
display can be made
via the control ele-
ments
It is not possible to
switch to the installer
level
B.2 Troubleshooting
Code/meaning
Remote control 1
communication inter-
rupted
Troubleshooting for additional fault messages (→ sensoCOMFORT operating and in-
stallation instructions, appendix)
B.3 Maintenance messages
Maintenance messages (→ sensoCOMFORT operating and installation instructions,
appendix)
30
Possible cause
Software error
No power supply at
the FM5
The product is defect-
ive
Software error
The product is defect-
ive
You do not know the
code for the installer
level
Possible cause
Incorrect plug connec-
tion
The cable is defective
Operating and installation instructions 0020287935_01
Measure
1. Press and hold the button on the top right
of the remote control for longer than five
seconds in order to force a restart.
2. Switch the mains switch on the heat gen-
erator that feeds the system control off and
back on again.
▶
Re-establish the power supply to the FM5;
this is the same power supply that feeds the
remote control.
▶
Replace the product.
▶
Switch the mains switch on the heat gen-
erator that feeds the system control off and
back on again.
▶
Replace the product.
▶
Reset the remote control to the factory set-
ting. All set values will be lost.
Measure
▶
Check the plug connection.
▶
Replace the cable.