BoilerFaultCodesYour boiler has reached an unsafe temperature and has automatically shut down to prevent damage or overheating.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: The safety temperature sensor has captured a temperature in excess of 105°C
What causes this fault?
This fault occurs when the water inside the boiler gets too hot too quickly, causing the safety system to shut everything down to prevent damage. The most common reasons are a pump failure that stops water from moving or a blockage in the heat exchanger that traps heat inside the unit. It can also be caused by air trapped in the system or a build-up of sludge restricting the flow.
This fault is often seen when the heating is first turned back on in autumn, as circulation pumps can seize up after being idle throughout the summer.
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.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like E9219 — no call-out fees, no surprises.
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