How much does it cost to fix Ideal error code b 33?

Typical repair cost for the Ideal b 33 fault is £120-200 including labour.

b 33 Medium

Ideal b 33 Fault Code

Q: What does the Ideal b 33 fault code mean?

Your boiler is currently unable to read the temperature of your hot water cylinder correctly, which prevents it from heating your hot water.

Also written as B33 — same fault.

The Ideal b 33 fault code means: your boiler is currently unable to read the temperature of your hot water cylinder correctly, which prevents it from heating your hot water.. It appears on 1 Ideal model in our database.

Technical description: Tank sensor short circuit

Typical repair cost £120-200 (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 33 fault code

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

Imax W Repair: £120-200

Source

Ideal b 33 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