BoilerFaultCodesYour boiler is briefly clearing heat from its internal system after finishing a task, which is usually a normal part of its operation.
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: DHW pump run on or for three way valve option, HTG pump run on with valve open to DHW (max. 5 minutes)
What causes this fault?
This code isn't actually a breakdown; it occurs when the boiler completes a task and needs to move excess heat away from the internal heat exchanger. It happens most often when the system is switching between heating your radiators and your hot water, or when a pump is continuing to run to protect the internal components from overheating.
DIY fix possible
Wait for 5 minutes to see if the code clears automaticallyCheck if your thermostat or hot water timer has just turned offEnsure your radiator valves are open to allow heat to dissipate
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A boiler cover plan would cover faults like 8 — no call-out fees, no surprises.
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