BoilerFaultCodesIdeal E2 Fault Code
The Ideal E2 fault code means: your indoor control panel has lost communication with the outdoor unit, meaning your heat pump cannot receive instructions to provide heating or hot water.. It appears on 1 Ideal model in our database.
Technical description: No connection Outdoor PCB to User Interface
What causes the Ideal E2 fault?
This fault occurs when the digital bridge between your indoor controls and the outdoor unit is broken, preventing them from talking to each other. The most common reasons are a loose or damaged connection cable, a blown fuse, or a technical failure within one of the main circuit boards.
This fault can occasionally occur after heavy storms or high winds if debris or moisture has compromised the external wiring connections.
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 E2 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal E2 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