What does the Ideal Mexico HE F59 fault code mean?
The F59 fault code on the Ideal Mexico HE indicates a fault with the domestic hot water (DHW) heat exchanger. This typically means that the heat exchanger is either blocked or has developed a leak, affecting the boiler’s ability to heat water effectively.
Common Causes
- Blocked Heat Exchanger: Scale build-up or debris can obstruct the flow of water, preventing efficient heat transfer.
- Leaking Heat Exchanger: Corrosion or damage can lead to leaks, causing a drop in pressure and loss of hot water supply.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer for this issue, as working on the heat exchanger involves gas and electrical components that require professional expertise.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for a faulty DHW heat exchanger on an Ideal Mexico HE is around £350 to £500. This includes parts and labour, as the heat exchanger itself can be expensive and requires skilled installation.