BoilerFaultCodesIdeal F H Fault Code
Also written as FH — same fault.
The Ideal F H fault code means: your boiler has detected that water is not moving through the system properly, which has caused it to stop working to prevent overheating.. It appears on 1 Ideal model in our database.
Technical description: No primary water flow
DIY fix possible
Check the pressure gauge and top it up to 1.5 bar if it is lowEnsure all radiator valves and isolation valves under the boiler are fully openCheck for any visible leaks around the pipework or radiatorsReset the boiler by turning the dial to 'reset' for a few seconds
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Ideal models that show the F H fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal F H 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