Maintenance; Troubleshooting - Zehnder ComfoConnect KNX C Manuel D'utilisation

7 Maintenance

Remove dust regularly from the ComfoConnect KNX
C with a dry duster.

8 Troubleshooting

The ComfoNet LED blinks quickly.
This indicates an electrical (connection) problem
with ComfoNet. Check the ComfoNet cabling,
connections, and connected nodes. When the
problem is resolved, the unit will automatically
reconnect to ComfoNet to continue normal
operation.
The KNX LED remains off.
This indicates a disconnected or unpowered KNX
bus. Check the KNX cabling, connections, and KNX
bus supply power. This is not related to configuration
by ETS.
After a firmware update, the ComfoConnect KNX
C does not behave properly.
When an error in the firmware prevents further
firmware updates, you can force the ComfoConnect
KNX C into update mode. For this, press and hold
the programming mode button and press and
release the reset button. The ComfoConnect KNX
C reboots to update mode. Retry to update the
firmware.
After a firmware update, all LEDs of the
ComfoConnect KNX C remain off.
Make sure the ComfoConnect KNX C has power. If
the problem still persists, a full factory reset can be
performed. For this, press and hold both the factory
reset button and the programming mode button.
Press and release the reset button. Release all other
buttons. The firmware and settings are erased,
and the ComfoConnect KNX C reboots to update
mode. Afterwards, a firmware update and KNX
configuration by ETS is required.
The Activity LED blinks once per second.
The unit has encountered an error. Use ETS to read
the State object to get the error code. Try to resolve
the issue accordingly.
KNX devices cannot change the Ventilation
Preset of the ventilation unit.
Try the following steps:
� Check if all LEDs are lit. Only the Activity LED may
flash once in a while. If this is not the case, check
the cabling and ComfoNet configuration.
� Check if the unit has been configured using
ETS. Check that the group objects are assigned
to the correct groups and that they have the
correct C/R/W/T/U flags. Based on the LED
behaviour, you cannot determine whether the KNX
configuration is correct, as this depends on the
needs and requirements of the KNX installation.
� Check if the other KNX devices are also assigned
to the proper group addresses.
The ventilation unit does not respond to settings,
and the State object has the value 40.
An incompatible ventilation unit firmware version
has been detected. Check online for an update of
either the ComfoConnect KNX or the ventilation unit.
Update one of the devices in order to match the
correct firmware version.
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