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My relative has a system boiler which operates fine.(Vokera) When the boiler is cold the pressure on the gauge drops to zero so naturally you would think there is a leak so top it up to 1bar pressure however if you put more than a cup full in when the boiler fires and it begins to heat up the...

My Megaflo is producing hotter water than usual . It well may be the Thermostat has failed but I understand the Thermal cut out switch may be the cause. Does any body know a sequence of tests/Checks that can be carried out Before changing both items. Thanks