HI there @DavePrice! I'm really sorry to hear that you encountered this issue, but I'll do my best to sort this our quickly. Can you please respond to the following set of steps and confirm the steps at the end?
Have you recently had service or maintenance on your electrical, plumbing, or heating system?
Have you tried any troubleshooting steps before contacting us?
How many zones are present in your setup?
Were there any power outages lately?
Check for all the breaker switches to be on.
Turn the breaker switches off and then on again.
Turn on manual mode. (press on the button of the Heat Link)
