BoilerFaultCodesIdeal ERROR CODE 2 Fault Code
Also written as ERRORCODE2 — same fault.
The Ideal ERROR CODE 2 fault code means: your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.. It appears on 2 Ideal models in our database.
Technical description: OVERHEAT ALARM
What causes the Ideal ERROR CODE 2 fault?
This fault occurs when the internal water temperature reaches an unsafe level, causing the boiler to shut down to protect its internal components. The most common reasons are a failed pump that isn't circulating the water, a blockage in the system, or a buildup of air that prevents heat from being carried away from the heat exchanger.
This issue is more common during the first cold spell of autumn when the heating is turned back on after sitting idle all summer, which can cause the pump to seize.
DIY fix possible
Check that your radiator valves are open and not turned to zero.Ensure there is enough water pressure in the system by checking the external filling loop gauge.Wait for the boiler to cool down and press the 'Reset' button on the front panel.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ideal models that show the ERROR CODE 2 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal ERROR CODE 2 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