Down at my MIL's this afternoon and she mentioned she had no hot water - a quick check of the boiler, error code as lacking pressure.
Found the two valves, turned the black plastic knobs and it started to fill up with pressure. All sorted.
But once it got to near 2, tried to turn back off and one of the plastic knobs broken in my hand. Thankfully I managed to grip it tight enough to grip the valve and turn the water supply off.
However made me think, what ultimately happen if I couldnt get this valve turned off? Would the system pressurise until it burst at its weakest point?
What would be the best course of action if valve didnt turn off? I guess try and turn off at stopcock?
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