BoilerFaultCodesYour boiler is currently providing hot water but is staying in that mode longer than expected.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: Burner on in D.H.W. mode
What causes this fault?
This code appears when the boiler stays in hot water mode for an unusually long time, often because a tap has been left running or there is a leak in the hot water pipework. It can also be caused by a sensor failing to detect that the water has reached the correct temperature, leading the boiler to keep firing indefinitely. While the boiler is stuck in this mode, it will prioritize hot water over your central heating.
DIY fix possible
Check all hot water taps are fully turned offCheck for any dripping taps or leaking hot water pipesMonitor the boiler to see if the code clears once demand for water ends
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A boiler cover plan would cover faults like 4 — no call-out fees, no surprises.
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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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