BoilerFaultCodesYour boiler has stopped working because the water pressure is too low to operate safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: The minimum permissible level for the safe and efficient operation of the appliance is 0.5 bar. Should the pressure fall below 0.5 bar, the boiler shuts off automatically.
What causes this fault?
This fault occurs when there isn't enough water circulating within your central heating system to allow the boiler to fire up safely. The most common cause is a slow leak from a radiator valve or pipework, though it can also happen if you have recently bled your radiators and didn't top up the water levels afterwards.
This issue is more frequent in autumn when homeowners turn their heating back on for the first time, as the change in system pressure can expose small leaks that developed over the summer.
DIY fix possible
Locate the filling loop (a flexible silver hose) underneath or near the boiler.Slowly open the one or two taps/valves on the hose until you hear water entering.Close the taps once the pressure gauge on the front of the boiler reaches between 1.0 and 1.5 bar.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like Pressure below 0.5 bar — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Vokera Mynute 10E is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.