BoilerFaultCodesIdeal HF Fault Code
The Ideal HF fault code means: your heat pump's internal computer chips are not communicating correctly because their configuration settings do not match each other.. It appears on 1 Ideal model in our database.
Technical description: Inverter not matched to Outdoor PCB dip switch setting
What causes the Ideal HF fault?
This fault occurs when the heat pump’s internal control boards are sending conflicting messages about how the system should operate. It usually happens because the physical switches on the main circuit board do not match the software settings on the inverter drive, preventing the unit from starting safely. This is typically caused by a component failure or a configuration error during a recent repair.
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 HF fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal HF 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