If you can no longer wake up your valve (thermostatic head) by turning the steering wheel from left to right, remove the batteries for one to two minutes. Reinsert the batteries, and you should see the "✓" battery check logo appear on the head. Then turn the handwheel left or right to see the temperature display.
If the problem persists, change the batteries, paying attention to the correct polarity.
Please contact our technical support at contact@comapsmarthome.com.