Everything has a computer in it. It probably doesn’t do very much. I don’t know what type of boiler you’re talking about, but it probably just watches the temperature and turns the boiler on or off. If it’s a gas boiler without a pilot light, then it probably ignites the gas for a certain amount of time when it turns on, and if it doesn’t see a flame it turns the gas off and beeps at you (so it won’t cause a gas leak). Simple stuff like that.
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