How much does it cost to fix Chaffoteaux error code 30-80 (M, L, L, M, L, M)?

Typical repair cost for the Chaffoteaux 30-80 (M, L, L, M, L, M) fault is £150-300 including labour.

30-80 (M, L, L, M, L, M) High

Chaffoteaux 30-80 (M, L, L, M, L, M) Fault Code

Q: What does the Chaffoteaux 30-80 (M, L, L, M, L, M) fault code mean?

Your boiler is failing to start because it cannot detect that the air fan is running and the water pressure may be incorrectly sensed.

Also written as 3080MLLMLM — same fault.

The Chaffoteaux 30-80 (M, L, L, M, L, M) fault code means: your boiler is failing to start because it cannot detect that the air fan is running and the water pressure may be incorrectly sensed.. It appears on 2 Chaffoteaux models in our database.

Technical description: Extractor off and pressure regulator at rest

Typical repair cost £150-300 (including labour)

Engineer required

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

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Chaffoteaux models that show the 30-80 (M, L, L, M, L, M) fault code

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

Source

Chaffoteaux 30-80 (M, L, L, M, L, M) fault code information on this page is sourced and cross-checked against the official Chaffoteaux service / installation manuals for each affected model.

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