BoilerFaultCodesYour boiler has detected that the water pressure is too low for it to operate safely, causing the system to shut down.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Water pressure switch fault
What causes this fault?
This fault occurs when the internal sensor detects that there isn't enough water inside the system to safely transfer heat. The most common reasons are a slow leak from a radiator valve or a loss of pressure in the expansion vessel, both of which cause the water level to drop over time.
This fault often appears when you first turn the heating back on for autumn, as the system struggles to maintain pressure after being sedentary all summer.
DIY fix possible
Locate the external filling loop, which is usually a flexible silver hose under the boiler.Slowly open the valves to let water into the system while watching the pressure gauge.Close the valves once the needle reaches between 1.0 and 1.5 bar, then restart the boiler.
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 E04 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Vokera Mynute Vhe 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.