How much does it cost to fix Ideal error code b 19?

Typical repair cost for the Ideal b 19 fault is £150-300 including labour.

b 19 High

Ideal b 19 Fault Code

Q: What does the Ideal b 19 fault code mean?

Your boiler has detected that the water returning to it is dangerously hot, causing it to shut down to prevent damage to the system.

Also written as B19 — same fault.

The Ideal b 19 fault code means: your boiler has detected that the water returning to it is dangerously hot, causing it to shut down to prevent damage to the system.. It appears on 1 Ideal model in our database.

Technical description: Return temperature >95degC

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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Ideal models that show the b 19 fault code

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

Imax W Repair: £150-300

Source

Ideal b 19 fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.

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