BoilerFaultCodesIdeal F07 Fault Code
The Ideal F07 fault code means: your boiler has detected that the electrical supply from the grid is currently too low for it to operate safely.. It appears on 3 Ideal models in our database.
Technical description: Low Mains Voltage: Contact Electricity Provider
What causes the Ideal F07 fault?
This fault occurs when the incoming electrical supply to your home drops below a level that is safe for the boiler's sensitive electronics to function. The most common reason is an issue with the local power grid or a 'brownout' in your area, though it can occasionally be caused by a fault within the boiler's internal control board incorrectly reading the voltage.
This fault is occasionally more common during periods of extreme cold or high peak demand when the national electrical grid is under heavy strain.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ideal models that show the F07 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal F07 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