H5 High

Ideal H5 Fault Code

The Ideal H5 fault code means: your heat pump is detecting an electrical overload in its power management system and has prevented itself from running to avoid damage.. It appears on 1 Ideal model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Inverter High Current (L1E/L11/L12) 3 times within 60mins
Typical repair cost £300-700 (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 H5 fault code

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

Source

Ideal H5 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 7 July 2026