Woke up this morning, and the house is really chilly. On the one hand, this would not be surprising: coldest night so far this side of the year, and it snowed overnight. On the other, it is much colder than it should be because we should have technology to address this.
Check the thermostat, it's set right... but when it clicks on, the combi-boiler does not. Fuck.
Hot water works, though. So it's either the controller, the cables, or the thermostat.