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Because I had all the other rads turned off and the one in the bedroom was the only one left open.

I want to know if, assuming the boiler isn't faulty already, me shutting off all the radiators can cause the water mains for my boiler to blow off and then the heat exchanger in the top of it to burst and why because that's what happened .

I don't know much about plumbing but from my understanding, shutting off all the radiators in your system with the heating on shouldn't cause your boiler to overpressure? The other night I closed off the radiator in my bedroom meaning that none of the radiators in the house were on but we still...