BoilerFaultCodes D.83 Low Information
Your boiler is notifying you that it has started heating up to provide hot water to your taps or cylinder.
Monitor it
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 start up in hot water mode
What causes this fault?
This is a normal operational message rather than a mechanical failure. It appears because your external controls, such as a thermostat or programmer, have sent a signal telling the boiler to begin heating the water for your tank. Once this process is complete, the status code will change or disappear.
Typical repair cost £0 (including labour)
DIY fix possible
This fault may be fixable without an engineer. Check your manual first.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like D.83 — no call-out fees, no surprises.
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