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Plumberpro, Home Appliance Technician
Category: Appliance
Satisfied Customers: 634
Experience:  Heating and hot water heating appliances experienced
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Ferroli F30B Boiler 8 years old. Pressure gauge reading is

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Ferroli F30B Boiler 8 years old. Pressure gauge reading is 3 and overflow continuously dripping. HES engineer has been out on three occasions but has failed to fix the problem. Bleeding a radiator reduces the pressure only temporarily.
Hi . the problem you have is that the expansion vessel is flat or slit inside. As the water heats from 1.5 bar the hot water expands. This expanded water is taken up in the expansion vessel. If the vessel is flat ( can be pumped up with a car tyre pump or strong bicycle pump) the pressure shoots up to 3 bar and dumps out the safety valve . drops to zero . then you are back where you started. Find the expansion vessel and its cap . take off the cap . press the pin in . if water comes out ,its split and will need replacing . if nothing then pump it up to 1.5 bar
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