BoilerFaultCodesYour boiler has lost the ability to measure the water pressure accurately, which has caused it to stop running for safety.
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 sensor fault
What causes this fault?
This fault occurs when the internal electronic sensor responsible for monitoring water pressure fails to send a reliable signal to the boiler's main control board. The most common reason is an electrical failure within the sensor itself or loose wiring, which prevents the boiler from confirming there is enough water to operate safely.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
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A boiler cover plan would cover faults like E78 — no call-out fees, no surprises.
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