BoilerFaultCodesYour boiler has detected that the water pressure is too low for the system to run safely and has shut down as a precaution.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Pressure too low or sensor error
What causes this fault?
This fault occurs when the water inside your central heating system drops below the minimum level required for the boiler to operate. The most common reasons are a small leak somewhere in your radiators or pipework, or air being released from the system after the radiators have been bled. Without enough water pressure, the boiler shuts down to prevent the internal heat exchanger from overheating.
This issue often appears in autumn when the heating is turned back on for the first time, as seals may have shrunk or settled during the summer months.
DIY fix possible
Locate the external filling loop (usually a silver flexible hose) under or near the boiler.Slowly open the small valves at each end of the hose until you hear water flowing.Watch the pressure gauge and close the valves once the needle 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 E10 — no call-out fees, no surprises.
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Remeha Avanta 18V 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.
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