Troubleshooting

The table below provides instructions for troubleshooting and repair.

Important:

We recommend you always use the latest software version. You can check the latest version at https://cloud.vallox.com.

Note:

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

Table 1. Troubleshooting
Error	Cause	Follow these steps
Error message: Extract air fan	The extract air fan has stopped.	Make sure the fan has really stopped. Check the fan wires and operation. If necessary, the fan must be replaced. Contact the service centre.
Error message: Supply air fan	The supply air fan has stopped.	Make sure the fan has really stopped. Check the fan wires and operation. If necessary, the fan must be replaced. Contact the service centre.
Error message: Temperature sensor 1/2/3/4/5	A temperature sensor indicated by the user interface is damaged.	Check the sensor installation. If necessary, the sensor must be replaced. Contact the service centre.
Error message: High supply air temperature	The supply air temperature is too high.	Check the operation of the post-heating and additional heating resistors. Make sure the resistors are on in the user interface. If necessary, contact the service centre.
Error message: Low supply air temperature	The supply air temperature is too low.	Check the operation of the post-heating and additional heating resistors. Make sure the resistors are on in the user interface. If necessary, contact the service centre.
Error message: Bus error	Problems in data transmission.	Make sure that the control panel and any external sensors are connected and working correctly.
Both the ventilation unit and the control panel do not work.	The unit’s power supply has been cut off or the safety switch pusher on the door does not touch the safety switch.	Check: Fuse on the fuse panel The unit’s glass tube fuse. Contact the service centre. Push in the safety switch and check does the unit start up. If the unit starts up, make sure the safety switch pusher on the door is pressing on the safety switch.
The ventilation unit works but the control panel does not work.	The control panel’s 24 VDC supply has been cut off, there are problems in data transmission or the control panel is damaged.	Check the cords between the unit and the control panel. Unplug the unit and restart the unit. Update the unit software. Contact the service centre.