It would be really handy if your boiler broke down in Summer. It can be realised.
We used to send bad PC,s back to head office and they would come back as working, we knew the serial numbers and jnew they were faulty. We had a lot of laptop power supplys. These put out 14v.
The end that plugs into the laptop, we had one paper clip sticking out of the centre hole and another wrapped around the outside, and a 6 mm gap between the ends of the paperclips. Just touching the terminals on a couple of the microchips on the motherboard with the power supply fried them.
The pc never worked after that. It was sent back and never returned.
The circuit board on a boiler are usually quite expensive and if a couple of chips on it are faulty, its usually written off.