How much does it cost to fix Ideal error code U 1.2?

Typical repair cost for the Ideal U 1.2 fault is £120-200 including labour.

U 1.2 High

Ideal U 1.2 Fault Code

Q: What does the Ideal U 1.2 fault code mean?

Your boiler has stopped working because a small protective device inside the electrical system has failed, cutting off the power needed to operate the internal controls.

Also written as U12 — same fault.

The Ideal U 1.2 fault code means: your boiler has stopped working because a small protective device inside the electrical system has failed, cutting off the power needed to operate the internal controls.. It appears on 1 Ideal model in our database.

Technical description: 24V fuse has blow

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 U 1.2 fault code

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

Imax W Repair: £120-200

Source

Ideal U 1.2 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