BoilerFaultCodesIdeal 94 H......F..... Fault Code
Also written as 94HF — same fault.
The Ideal 94 H......F..... fault code means: your boiler is struggling to detect the flame needed to heat your water, which is causing the system to shut down for safety.. It appears on 3 Ideal models in our database.
Technical description: FLAME DETECTION ERROR
What causes the Ideal 94 H......F..... fault?
This fault occurs when the boiler's internal sensor fails to confirm that a flame has successfully ignited, even if you can hear the unit trying to start. The most common reasons are a worn-out sensor probe that can no longer 'see' the flame or a buildup of carbon soot that prevents the electrical signal from passing through accurately.
DIY fix possible
Check if other gas appliances in your home, like a hob, are working to ensure gas is reaching the propertyCheck that your prepaid gas meter has creditPress the 'Reset' button on the front of the boiler once
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ideal models that show the 94 H......F..... fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 94 H......F..... 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