BoilerFaultCodesTechnical description
Boiler overheat tripped
What causes this fault?
This fault occurs when the water inside the boiler exceeds a safe temperature limit, triggering a safety sensor to cut the power. The most common reason is that the internal pump has failed or seized, meaning the heat generated by the burner cannot be carried away to your radiators. It can also be caused by a blockage in the pipework or a build-up of air preventing the water from circulating properly.
This fault is frequently seen in autumn when heating systems are turned back on after being idle all summer, which can cause the internal pump to stick or seize.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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