Heat link is dead. Error H72

[Ali7570]

No heat due to Heat Link gone dead. No lights on box. Have manually put on hot water but need heat as it’s so cold. Any ideas how I can do this whilst getting this issue sorted? And please can you help sort this issue please. Had the Nest thermostat and heat link about 2 1/2 years. 

[LarisaL]

Hi there! I'm really sorry to hear about this, but I'll do my best to help. Could you please respond to the following set of questions and also try 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 recently?

Troubleshooting steps:


Check for all the breaker switches to be on.
Turn the breaker switches off and then on again.
Turn on manual mode, by pressing on the button of the Heat Link.

[Vladut]

Hi there, just checking in with you. Did you manage to check my colleague's last message?