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As far as I can tell its run from the switch. I don't have a voltage checker. Not sure its worth spending £40-50 on one.

I swapped the fuse. The programmer came on for a split second and then went off again.

Hi I have a glow worm back boiler with a wall mounted UP2 programmer. earlier today the power to the programmer cut out, so as a result I can't turn on my boiler. I'm guessing that it is a fuse problem. But I don't know if there is a fuse inside the box or not, and I'm a little reluctant...