BoilerFaultCodesIdeal 30 Fault Code
The Ideal 30 fault code means: your boiler has detected an issue with the electrical power supply to the unit while it was running.. It appears on 2 Ideal models in our database.
Technical description: Check the mains supply during operation.
What causes the Ideal 30 fault?
This fault occurs when the boiler detects an unstable electrical signal or a sudden drop in voltage while it is firing. It is usually caused by a loose connection in the internal wiring, a failing control board, or an issue with the electrical circuit providing power to the unit.
DIY fix possible
Check if other appliances in your home have power.Ensure the boiler's fused spur switch is fully turned on.Reset the boiler by following the instructions on the display 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 30 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 30 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