BoilerFaultCodesIdeal L52 Fault Code
The Ideal L52 fault code means: your heat pump’s engine has stopped unexpectedly and is unable to restart, meaning your heating and hot water will likely stop working.. It appears on 1 Ideal model in our database.
Technical description: Compressor Stall Error
What causes the Ideal L52 fault?
This fault occurs when the main pump inside the unit attempts to start but becomes stuck or cannot maintain enough power to keep running. It is often caused by an electrical failure in the control board or a physical blockage that prevents the internal mechanism from spinning freely.
This issue is more frequent during extreme cold snaps when the system has to work much harder to start up against high pressure.
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 L52 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal L52 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