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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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My boiler has gone meltdown bar pressure increased by 3 how

Customer Question

My boiler has gone meltdown bar pressure increased by 3 how do i reduce bar pressure
Submitted: 2 years ago.
Category: Appliance
Expert:  Plumberpro replied 2 years ago.
Your expansion vessel in your boiler is either flat or split.
As the water gets heated it expands. This expanded water to pushes into the expansion vessel which has a balloon inside. If this goes flat or splits the water has nowhere to go and will go up to three bar and dump out of the safety valve( preset at 3bar to release).
Take the cover off the boiler ,with power off . drop the pressure to zero( release water from a rad bleed valve into a lot) then unscrew he exp vessel cap( like a car tyre cap) and pump it up with a car foot pump to 1.5 bar . refill the system to 1.2-1.5 .should run normally. If it still happens replace the vessel
Customer: replied 2 years ago.
Can you help me one to one
Expert:  Plumberpro replied 2 years ago.
Hi I've submitted the one on one offer, awaiting your approval