BoilerFaultCodesIdeal H A Fault Code
Also written as HA — same fault.
The Ideal H A fault code means: your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.. It appears on 1 Ideal model in our database.
Technical description: Boiler is not working for central heating or hot water. Check pressure gauge on boiler shows a minimum of 1 bar. (Loss of system water pressure)
DIY fix possible
Locate the external filling loop, which is usually a flexible silver braided hose under your boiler.Open the valves at both ends of the hose to let mains water into the system until the pressure gauge reads between 1 and 1.5 bar.Close both valves tightly to stop the flow of water and check the gauge remains steady.
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Ideal models that show the H A fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal H A 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