Have been worrying about our home's central heating for days. Hot water was OK, but radiators and underfloor heat? Not doing too good, especially during a cold snap. Kids not wanting to get up because the bathroom is cold. Brrrr, I get it kid, me too.

These things are too smart nowadays, a bug snuck in. The outdoor temp sensor, or the variable holding its value, was stuck on 12°C when it was 4°C. So it didn't heat the heating circuit's water enough, and didn't run the pumps to push it around.

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