BoilerFaultCodesIdeal F16 Fault Code
The Ideal F16 fault code means: your boiler has detected an internal electrical problem with the gas control valve, meaning it cannot safely ignite to provide heating or hot water.. It appears on 3 Ideal models in our database.
Technical description: Gas Valve Fault: Check gas valve wiring, if OK replace gas valve
What causes the Ideal F16 fault?
This fault occurs when the boiler's main control board loses the electrical connection with the gas valve or detects that the valve is not responding correctly. It is usually caused by a component failure within the gas valve itself or a faulty connection on the circuit board that prevents the boiler from safely controlling the flow of gas.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Ideal models that show the F16 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal F16 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