BoilerFaultCodesIdeal LC1 Fault Code
The Ideal LC1 fault code means: your heat pump has stopped working because its internal computer board is having trouble communicating with the motor that runs the system.. It appears on 1 Ideal model in our database.
Technical description: Inverter Error
What causes the Ideal LC1 fault?
This fault occurs when the system's brain and the high-power motor that drives the heating process stop talking to each other. It is usually caused by an internal electrical failure on the inverter board or a loose wiring connection that prevents the system from regulating its power levels safely.
This fault can be more prevalent during summer or during sudden heatwaves, as the inverter components are under higher thermal stress when the unit is working hard to provide cooling or high-temperature hot water.
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 LC1 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal LC1 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