How much does it cost to fix Baxi error code Indicator light inside box lit?

Typical repair cost for the Baxi Indicator light inside box lit fault is £90-160 including labour.

Indicator light inside box lit Emergency

Baxi Indicator light inside box lit Fault Code

Q: What does the Baxi Indicator light inside box lit fault code mean?

Your boiler has detected that the electrical wiring coming into the unit is connected the wrong way around, which is a safety risk.

Also written as INDICATORLIGHTINSIDEBOXLIT — same fault.

The Baxi Indicator light inside box lit fault code means: your boiler has detected that the electrical wiring coming into the unit is connected the wrong way around, which is a safety risk.. It appears on 2 Baxi models in our database.

Technical description: Indicates that the live and neutral electrical connections are reversed.

Typical repair cost £90-160 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Baxi models that show the Indicator light inside box lit fault code

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

Source

Baxi Indicator light inside box lit 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