BoilerFaultCodesIdeal LBE Fault Code
The Ideal LBE fault code means: your heat pump has detected a pressure level that is too high within the system and has shut down to prevent damage.. It appears on 1 Ideal model in our database.
Technical description: High Pressure Switch Operated
What causes the Ideal LBE fault?
This fault occurs when the internal pressure of the refrigerant or the water system exceeds safe operating limits, triggering a safety switch to protect the unit. The most common reasons are a lack of water flow through the heat pump caused by a blocked filter or a failing circulation pump, which prevents heat from being transferred away quickly enough.
This fault is more common during the first cold snaps of autumn or winter when the system is under higher load after being idle during the summer months.
DIY fix possible
Check that all radiator valves are fully openEnsure there are no external debris or plants blocking the airflow to the outdoor unitCheck that the internal central heating valves (usually near the cylinder) are in the open position
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Gas Safe Register →Ideal models that show the LBE fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal LBE 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