Mains LED off High

Baxi Mains LED off Fault Code

Also written as MAINSLEDOFF — same fault.

The Baxi Mains LED off fault code means: your boiler has lost all power and is completely shut down, meaning it cannot provide any heating or hot water.. It appears on 2 Baxi models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Mains supply failure, fuse failure, or control PCB/transformer fault.
Typical repair cost £90-250 (including labour)

DIY fix possible

Check your home's consumer unit (fuse box) to ensure the boiler's circuit breaker hasn't tripped.Ensure the fused spur switch located near the boiler is turned on.Check that the fuse inside the fused spur switch has not blown.

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Baxi models that show the Mains LED off fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Baxi Mains LED off fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026