Hi there, thanks for reaching out! I'm so sorry to hear about this situation, but I'll be more than happy to assist you. Please try the steps below and let me know how it goes:
Turn off the WiFi router.
1. Reset the Heat Link by keeping th e button on it pressed for 30 seconds until the LED goes slowly pulsing blue.
2. Take the thermostat off the base and give it a restart, off the base by holding the display and the back of the thermostat pressed for 10-12 seconds.
3. While the thermostat is restarting, do not put it back on the base yet, but instead, reset the Heat Link again just like before.
4. After the Heat Link is reset, put the thermostat back on the base when it asks you to do so on the screen.
5. Go to: Replace Heat Link (underneath the H71 error code) and enter the 6 character entry key from the Heat Link, but do not connect just yet. I suggest you take off the cover from the Heat Link and on the inside, on the left part of it, you will see the entry key.
6. Restart the Heat Link twice (1 restart is a 10 seconds press, until the LED goes off once).
7. Press connect on the display.
