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Still not the problem? quite possibly

Still not the problem? quite possibly, your expansion vessel may need to be pressurized if the pressure appears to rise rapidly in the vessel, then suddenly drops when the pressure relief valve opens, it’s time for your expansion vessel to be recharged but you’ll need an expert to do a pressure check to be certain that’s really the issue the vessel will have to be drained first and then the pressure checked. Convenient locations ensure you are.

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