How much does it cost to fix Chaffoteaux error code 13?

Typical repair cost for the Chaffoteaux 13 fault is £120-250 including labour.

13 High

Chaffoteaux 13 Fault Code

Q: What does the Chaffoteaux 13 fault code mean?

Your boiler pressure is rising too high because water is leaking into the system when it shouldn't be, which could cause a leak or pipe burst.

The Chaffoteaux 13 fault code means: your boiler pressure is rising too high because water is leaking into the system when it shouldn't be, which could cause a leak or pipe burst.. It appears on 3 Chaffoteaux models in our database.

Technical description: Gain in pressure shown on gauge - Filling loop letting by or secondary heat exchanger leak

Typical repair cost £120-250 (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 13 fault code

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

Source

Chaffoteaux 13 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