HHHHH:::::AAAAA High

Ideal HHHHH:::::AAAAA Fault Code

Also written as HHHHHAAAAA — same fault.

The Ideal HHHHH:::::AAAAA fault code means: your boiler has stopped heating your radiators and water because the internal water pressure has dropped too low.. It appears on 3 Ideal models 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: Boiler is not working for central heating or hot water; check pressure gauge on boiler shows a minimum of 1 bar.
Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the filling loop (usually a silver braided hose with one or two valves) underneath the boiler.Slowly open the valve(s) to let water enter the system while watching the pressure gauge on the front panel.Stop when the needle reaches the green zone, ideally around 1.5 bar, and ensure the valve is tightly closed.

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Ideal models that show the HHHHH:::::AAAAA fault code

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

Source

Ideal HHHHH:::::AAAAA 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