BoilerFaultCodesIdeal F7 Fault Code
The Ideal F7 fault code means: your boiler is not receiving enough electrical power from the grid to operate safely and has shut down as a precaution.. It appears on 25 Ideal models in our database.
Technical description: LOW MAINS VOLTAGE - CONTACT ELECTRICITY PROVIDER
What causes the Ideal F7 fault?
This fault occurs when the electrical supply entering your home drops below the minimum voltage required for the boiler's sensitive electronics to function. While it is often caused by a temporary dip or brownout in the local power grid, it can also be triggered if the boiler's internal control board develops a fault and can no longer process the incoming power correctly.
This fault can be more common during periods of extreme cold or heatwaves when the national electricity grid is under high demand, leading to localized voltage drops.
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.
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A cover plan would handle faults like F7: no call-out fees, no surprise bills.
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Ideal models that show the F7 fault code
Click a model for the full fault code list and model-specific repair notes.
- Atlantic Combi Repair: £120-250
- Classic Repair: £100-350
- CLASSIC2 Repair: £100-350
- ESPRIT ECO2 Repair: £100-350
- EXCLUSIVE2 Repair: £100-350
- GB24 / GB30
- i Combi 2 Repair: £0-350
- i-mini C24 / C30
- Independent Repair: £120-250
- INDEPENDENT + COMBI Repair: £0-350
- Independent C24 Repair: £120-250
- INDEPENDENT SYSTEM Repair: £0-350
- Independent System S15 Repair: £0-350
- INSTINCT2 Repair: £100-350
- Instinct2 24 Repair: £100-350
- Logic Air Repair: £150-300
- Logic Code Combi ESP1 Repair: £0-120
- Logic Combi C24 C30 C35 Repair: £0-250
- Logic Combi ESP1 Repair: £0-120
- LOGIC HEAT Repair: £0-350
- Logic Max Combi Repair: £0-120
- Logic Max Heat Repair: £0-350
- Logic Max System Repair: £0-120
- LOGIC SYSTEM Repair: £0-350
- Logic+ Heat H Repair: £100-350
Source
Ideal F7 fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.
- Ideal GB24 / GB30 manual (PDF)
- Ideal Independent System S15 manual (PDF)
- Ideal Instinct2 24 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026