BoilerFaultCodesIdeal L1E Fault Code
The Ideal L1E fault code means: your heat pump's internal power system is detecting an electrical surge or overload, causing the unit to shut down to prevent damage.. It appears on 1 Ideal model in our database.
Technical description: Inverter High Current
What causes the Ideal L1E fault?
This fault occurs when the brain of the heat pump detects a sudden electrical spike or excessive strain on the internal motor. This is usually triggered by a faulty control board sending the wrong signal or the compressor drawing too much power because it is struggling to start. In some cases, a loose electrical connection or moisture on the wiring can also cause this safety shut-down.
This fault can be more frequent during extreme heatwaves or cold snaps, when the system has to work at its maximum capacity for long periods, putting more stress on the electrical 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 L1E fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal L1E 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