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How do I check if power is getting to the boiler? Like I said, the boiler makes no sound and the light remains off. But the fuse next to the control box/timer is fine and the control box is on. How do you check if power is getting to the boiler? What motorised valves should I check?

I've done that. (I called it the emergency thermostat switch but yes it is called the overheat.) it unscrews and I've pushed it. Still nothing. Not a sound, not a light.

I have a Grant Multipass Sealed Boiler from 2003 running on oil. I didn't notice that the water pressure was almost (possible at) 0. I've got the pressure back up to 1 but now the boiler is dead. The fuse in the main house fuse box marked "heating" has not tripped. The fuse in the power supply...