BoilerFaultCodesIdeal LCD Fault Code
The Ideal LCD fault code means: your heat pump has stopped working because of a communication or electrical issue within the internal power control system.. It appears on 1 Ideal model in our database.
Technical description: Inverter Error
What causes the Ideal LCD fault?
This fault occurs when the main control board loses the ability to communicate with the inverter that powers the pump's compressor. It is usually caused by a physical failure of the internal electronic circuitry or a loose wiring connection that prevents power from reaching the motor. Essentially, the 'brain' of the unit can no longer tell the motor how fast to run, so the system shuts down to prevent electrical damage.
This error is often more frequent during the first cold snap of autumn or during summer heatwaves, as extreme temperatures put the highest electrical stress on the inverter components.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ideal models that show the LCD fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal LCD 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