BoilerFaultCodesIdeal HE Fault Code
The Ideal HE fault code means: your boiler has detected that the water inside it is getting too hot, causing it to shut down for safety.. It appears on 4 Ideal models in our database.
Technical description: ALTERNATING 'H' 'E' GO TO FRAME 86
What causes the Ideal HE fault?
This fault occurs when the water within the boiler exceeds a safe temperature limit, triggering a safety shut-off to protect the internal components. It is physically caused by a lack of water flow, often due to a broken internal pump or a blockage in the pipework that prevents heat from being carried away. In some cases, a faulty sensor may be incorrectly reporting that the system is overheating when it is actually at a normal temperature.
This issue often surfaces during the first few cold days of autumn when the central heating is turned back on after being idle all summer, which can cause the pump to become stuck.
DIY fix possible
Check that all radiator valves are fully openEnsure the boiler pressure is between 1 and 1.5 bar on the gaugeWait for the unit to cool down and press the reset button
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Ideal models that show the HE fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal HE 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