BoilerFaultCodesYour boiler has detected that the water returning from your radiators is getting too hot, indicating a possible circulation or sensor issue.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Return sensor temperature exceeded
What causes this fault?
This fault occurs when the boiler detects that the water returning from your radiators is nearly as hot as the water leaving the unit, meaning heat isn't being transferred into your rooms. The most common reasons are a blockage in the system, a failing pump that isn't moving the water fast enough, or a faulty sensor providing an incorrect temperature reading.
This issue is more common when turning the heating back on after summer, as pump components can seize or sludge can settle during long periods of inactivity.
DIY fix possible
Check that all radiator valves (TRVs) are fully openEnsure the boiler pressure is between 1.0 and 1.5 barRestart the boiler using the reset dial
Find a Gas Safe engineer
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Gas Safe Register →Protect yourself from future repair bills
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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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