BoilerFaultCodesIdeal F14 Fault Code
The Ideal F14 fault code means: your boiler has detected that the electricity supply coming into your home is at a dangerously high voltage, which could damage the internal electronics.. It appears on 3 Ideal models in our database.
Technical description: High Mains Voltage: Contact electricity provider
What causes the Ideal F14 fault?
This fault occurs when the boiler's internal sensors detect that the incoming electrical supply from the national grid has exceeded safe operating limits. While it can sometimes be a sign of a faulty control board, it is usually caused by an external surge or a problem with the local power infrastructure in your street. The boiler shuts down as a safety precaution to prevent the high voltage from frying its sensitive electronic components.
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 F14 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal F14 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