BoilerFaultCodesIdeal EP Fault Code
The Ideal EP fault code means: your boiler's internal computer parts are unable to talk to each other correctly because they are not compatible.. It appears on 1 Ideal model in our database.
Technical description: Control panel and BIM not compatible.
What causes the Ideal EP fault?
This fault occurs when the main control board and the interface module inside the boiler are unable to communicate because they do not recognise each other's software versions. The most common reason is that a replacement part has been installed that is not the correct match for the specific model, or a internal electronic failure has caused the components to lose their configuration.
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 EP fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal EP 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