BoilerFaultCodesIdeal EF Fault Code
The Ideal EF fault code means: your boiler's main internal computer has developed a fault and can no longer control the heating system correctly.. It appears on 1 Ideal model in our database.
Technical description: Defective control panel.
What causes the Ideal EF fault?
This fault occurs when the boiler's internal computer chips or electrical circuits suffer a hardware failure, meaning it can no longer send or receive instructions to other parts like the pump or gas valve. The most common reason is general wear and tear of the electronic components, or sometimes a power surge that damages the sensitive circuitry on the board.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ideal models that show the EF fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal EF 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