System was working fine today (and has been faultless since installed). However, it is now not heating, and the heatlink seems to have failed.
I've measured power (245V) going in. None of the lights are on.
I've tried switching off and waiting 30s then switching back on.
I've tried pressing the "nest" button for 20, 30 and 40 seconds.
Nothing has solved the problem - no lights show. I'm assuming the heatlink has failed - how do I get a replacement?
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