How to fix Ideal Mexico HE fault code F28

What does the Ideal Mexico HE F28 fault code mean?

The F28 fault code on the Ideal Mexico HE indicates that the boiler has failed to ignite, resulting in no flame being detected. This can prevent the heating and hot water from functioning properly.

Common Causes

  • Gas Supply Issue: There may be a problem with the gas supply, such as a closed valve or an interruption in the gas line.
  • Flame Sensor Fault: The flame sensor may be dirty or faulty, preventing it from detecting the flame correctly.

Can I fix it myself? (DIY)

It is advisable to call a Gas Safe Engineer for any gas-related issues. However, you can check that the gas supply is on and reset the boiler by pressing the reset button if applicable.

Estimated Repair Cost (2026 UK Prices)

The estimated repair cost for addressing the F28 fault could range from £100 to £250, depending on whether the issue is with the gas supply or requires replacement of the flame sensor, which typically costs around £150.