BoilerFaultCodesIdeal LCB Fault Code
The Ideal LCB fault code means: your heat pump has encountered a communication or power issue with the internal electronics that manage the motor, causing the system to stop working.. It appears on 1 Ideal model in our database.
Technical description: Inverter Error
What causes the Ideal LCB fault?
This fault occurs when the main control system loses its ability to talk to the part that regulates the heat pump's motor speed. The most common reason is a hardware failure within the inverter circuit board or a loose connection in the wiring that carries signals between these internal 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 LCB fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal LCB 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