BoilerFaultCodesIdeal L47 Fault Code
The Ideal L47 fault code means: your heat pump has stopped working because the internal power control system has detected an electrical fault.. It appears on 1 Ideal model in our database.
Technical description: Inverter Error
What causes the Ideal L47 fault?
This fault occurs when the internal brain of the heat pump loses communication with the power system or detects an electrical surge. It typically signals that the inverter board has failed or is trying to protect the compressor from damage due to unstable voltage. The system shuts down immediately to prevent expensive electrical components from burning out.
This fault can be more frequent during summer heatwaves or extreme winter cold when the inverter is under maximum load to maintain target temperatures.
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 L47 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal L47 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