164-026 High

Ideal 164-026 Fault Code

Also written as 164026 — same fault.

The Ideal 164-026 fault code means: your boiler has stopped working because a sensor that measures water temperature is providing an incorrect reading or has become disconnected.. It appears on 6 Ideal models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Temperature probe (main or DHW circuit)
Typical repair cost £120-220 (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 164-026 fault code

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

Source

Ideal 164-026 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 27 April 2026