BoilerFaultCodesTechnical description
Safety switch off temperature is rising to fast
What causes this fault?
This fault occurs when the boiler detects that the internal temperature is rising too quickly, triggering a safety shutdown to prevent overheating. It is usually caused by a blockage in the pipes or a failing pump that prevents hot water from leaving the boiler quickly enough. Essentially, the heat can't escape into your radiators, so it builds up inside the unit almost instantly.
This fault is more common in autumn when heating systems are turned back on after a long summer break, as internal pump parts can seize up from lack of use.
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.
Find a Gas Safe engineer
Search the official register →