📋 Key Takeaways
- 1.What it means: The pump is running after the boiler has shut down to protect the heat exchanger. This is a normal function but can indicate a fault if it occurs very frequently.
- 2.What to do: This is usually normal. If the pump is constantly running, a Gas Safe engineer should check the system.
- 3.DIY or engineer? You can try one reset after addressing the cause. If it returns, call a Gas Safe engineer.
Fault Code L2: Pump overrun / anti-cycle
The pump is running after the boiler has shut down to protect the heat exchanger. This is a normal function but can indicate a fault if it occurs very frequently.
This fault code can often be cleared by addressing the underlying issue (e.g. repressurising) and pressing the reset button once. If the fault returns after one reset, do not keep resetting — call a Gas Safe engineer to investigate.
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The component-level repair guide for this fault code is available to Pro subscribers — designed for Gas Safe engineers and heating professionals.
- ✓Exact components to test and replace
- ✓Pressure and temperature diagnostic values
- ✓Common misdiagnosis warnings
- ✓Printable fault diagnosis sheet
- ✓Direct links to genuine spare parts
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