How much does it cost to fix Ideal error code H2?

Typical repair cost for the Ideal H2 fault is £120-450 including labour.

H2 High

Ideal H2 Fault Code

Q: What does the Ideal H2 fault code mean?

Your boiler has detected an internal electronic communication failure or a technical error that requires a deep-level diagnosis by a professional.

The Ideal H2 fault code means: your boiler has detected an internal electronic communication failure or a technical error that requires a deep-level diagnosis by a professional.. It appears on 2 Ideal models in our database.

Technical description: ALTERNATING 'H' '2' GO TO FRAME 91

What causes the Ideal H2 fault?

This fault occurs when the boiler's internal computer brain loses its ability to send or receive messages across its circuitry. The most common reason is an electronic failure within the main printed circuit board or a loose connection in the internal wiring. This break in communication means the boiler can no longer monitor safety sensors or control the heating process, so it shuts down as a precaution.

Typical repair cost £120-450 (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 H2 fault code

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

Source

Ideal H2 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