BoilerFaultCodesYour boiler is currently showing you the live temperature of the hot water it is producing, which is a normal status message rather than an error.
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: Hot water flow temperature reading
What causes this fault?
This is a status code rather than a mechanical failure, occurring when the boiler sensor detects a demand for hot water. It simply means the internal computer is measuring and displaying the temperature of the water currently being heated for your taps or shower. You will see this code every time you turn on a hot tap as part of the boiler's standard operating sequence.
DIY fix possible
No action is required as this is a status code, not a fault.If the boiler is stuck on this code and not providing heat, try resetting the boiler.Ensure your hot water taps are fully closed.
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A boiler cover plan would cover faults like D.3 — no call-out fees, no surprises.
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