65 Medium

Ideal 65 Fault Code

The Ideal 65 fault code means: your boiler has lost its connection with the thermostat that controls your home's temperature, meaning it no longer knows when to turn your heating on or off.. It appears on 3 Ideal models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Room Stat 2 Fault
Typical repair cost £120-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ideal models that show the 65 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ideal 65 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 7 July 2026