What does the Ideal Mexico HE F79 fault code mean?
The F79 fault code indicates a communication issue between the boiler’s control board and the domestic hot water (DHW) system. This fault can prevent the boiler from providing hot water, leading to a disruption in service.
Common Causes
- Wiring Issues: Damaged or loose wiring connections can disrupt communication between components.
- Faulty DHW Sensor: A malfunctioning sensor may fail to relay accurate information to the control board, triggering the fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and gas safety regulations. Attempting DIY repairs could be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving an F79 fault could range from £150 to £300, depending on whether wiring repairs or component replacements (like the DHW sensor) are needed.