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 https://www.vallox.com.

Note:

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

Table 1. Troubleshooting
Fault	Cause	Proceed as follows:
Error message: Extract air fan	The extract air fan has stopped.	Make sure that the fan is not running. The fan cabling and operation must be checked and, where required, the fan must be replaced. Contact the service centre.
Error message: Supply air fan	The supply air fan has stopped.	Make sure that the fan is not running. The fan cabling and operation must be checked and, where required, 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 has become damaged.	The sensor installation must be checked and, where required, the sensor must be replaced. Contact the service centre.
Error message: High supply air temperature	The supply air temperature is too high.	The operation of the post and additional heating resistor must be checked. Ensure that the resistors are turned on in the user interface. Contact the service centre if necessary.
Error message: Low supply air temperature	The supply air temperature is too low.	The operation of the post and additional heating resistor must be checked. Ensure that the resistors are turned on in the user interface. Contact the service centre if necessary.
Error message: Bus fault	Problems with the data transfer bus.	Ensure that the control panel and any external sensors are connected correctly and are functioning properly.
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: The fuse in the fuse box The glass tube fuse in the unit. Contact the service centre. 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.	Either the control panel 24 VDC power is lost, there is a problem with data transmission, or the control panel has become 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.