BoilerFaultCodesIntergas E02 Fault Code
The Intergas E02 fault code means: your boiler has shut down because the water inside it has become too hot, causing it to overheat for safety.. It appears on 6 Intergas models in our database.
Technical description: Lockout temperature exceeded
What causes the Intergas E02 fault?
This fault occurs when water cannot circulate through the boiler quickly enough to carry heat away, causing the internal temperature to reach a dangerous level. The most common reasons are a failed pump that isn't pushing water around, a blockage in the pipework, or air trapped within the heat exchanger. It acts as a safety 'trip' to prevent the appliance from being damaged by extreme heat.
This fault often appears when the heating is first turned on after summer, as the internal pump can seize up from months of inactivity.
DIY fix possible
Check that all radiator valves are fully open to allow water to flow.Ensure your system pressure is between 1.0 and 1.5 bar on the gauge.Press the 'reset' button on the boiler control panel once the unit has cooled down.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Intergas models that show the E02 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Intergas E02 fault code information on this page is sourced and cross-checked against the official Intergas service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026