BoilerFaultCodesIdeal L11 Fault Code
The Ideal L11 fault code means: your heat pump has shut down because a specific part of its motor or power electronics is drawing too much electricity.. It appears on 1 Ideal model in our database.
Technical description: Inverter High Current
What causes the Ideal L11 fault?
This fault occurs when the internal electrical safety systems detect a power surge or excessive current being drawn by the heat pump's motor. It is usually caused by a failure in the electronic control board or an internal electrical fault within the compressor itself, which forces the system to shut down to prevent further damage. The system essentially blows a virtual fuse because the components are working harder than they are safely designed to.
This fault can be more frequent during extreme summer or winter temperatures when the compressor is required to run at its maximum speed for extended periods.
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 L11 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal L11 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