How much does it cost to fix Baxi error code Lt?

Typical repair cost for the Baxi Lt fault is £150-250 including labour.

Lt High

Baxi Lt Fault Code

Q: What does the Baxi Lt fault code mean?

Your boiler is failing to detect that you have turned on a hot tap, so it is not heating the water for your shower or kitchen faucet.

Also written as LT — same fault.

The Baxi Lt fault code means: your boiler is failing to detect that you have turned on a hot tap, so it is not heating the water for your shower or kitchen faucet.. It appears on 1 Baxi model in our database.

Technical description: DHW Flow Switch section

Typical repair cost £150-250 (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 Lt fault code

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

130 HE (range) Repair: £150-250

Source

Baxi Lt 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