This video will show you how to factory reset the NX Controller. The NX Controller is found with the following Aquatrol valve models:

AQT-275
AQT-285
AQT-290
AQT-315
AQT-385
AQT-390

After the factory reset is done, please reprogram your valve completely.

WARNING: We strongly suggest this maintenance be performed by a water treatment professional.

For more details about your valve, check the installation manual. You can download it here:

https://aquatroltech.com/dl/manuals/AQT-NX_Manual.pdf