BoilerFaultCodesIdeal T2 Fault Code
The Ideal T2 fault code means: your heat pump has detected a problem with a temperature sensor inside the outdoor unit, which has caused the system to stop working to protect itself.. It appears on 1 Ideal model in our database.
Technical description: Outdoor Unit, Plate Heat Exchanger Outlet Refrigerant Thermistor (T2) Error
What causes the Ideal T2 fault?
This fault occurs when the control system receives an incorrect or missing signal from the sensor that monitors the temperature of the refrigerant as it leaves the heat exchanger. The most common reason is a physical failure of the sensor's internal components or loose electrical connections caused by the constant vibrations of the outdoor unit.
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 T2 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal T2 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