Troubleshooting

The table below contains troubleshooting and fault repair instructions.

Important

We recommend that the latest software version be always used. Check the latest version at http://www.vallox.com.

Note

Error messages are displayed on the control panel and in the MyVallox Home and MyVallox Cloud services.

Table 77. Troubleshooting

Fault	Cause	Proceed as follows:
Error message: Extract air fan stopped	The extract air fan has stopped.	Make sure that the fan is not running. The fan cabling and operation must be checked, and if necessary the fan must be replaced. Contact the service centre.
Error message: Supply air fan stopped	The supply air fan has stopped.	Make sure that the fan is not running. The fan cabling and operation must be checked, and if necessary the fan must be replaced. Contact the service centre.
Error message: Temperature sensor 1/2/3/4/5	The temperature sensor indicated on the user interface is damaged.	The sensor installation must be checked, and if required the sensor must be replaced. Contact the service centre.
Error message: Bus fault	Problems with the data transfer bus.	Make sure that the Modbus bus is connected correctly, and that the devices connected to it are properly functioning.
The ventilation unit is not working; the control panel is not working.	Power input to the unit is lost or the safety switch catch of the door is not touching the safety switch.	Check: Fuse in the fuse box Fuse in the unit Press the safety switch all the way down and test if the unit can be turned on. If the unit can be turned on, ensure that the safety switch catch is engaged.
The ventilation unit is working, but the control panel is not working.	Either the control panel 24 VDC power is lost, there is a problem with data transmission, or the control panel is damaged.	Check the cables from the unit to the control panel. Restart the unit by unplugging the power cord. Update the unit software. Contact the service centre if necessary.