Ideal · Logic MAX Heat2

Return Thermistor Fault

Logic MAX Heat2 (H12 / H15 / H18 / H24 / H30)

What Return Thermistor Fault means

Return thermistor fault.

Home step: No boiler action is listed. Contact your installer or a Gas Safe registered engineer.

Gas Safe registered engineer: Contact your installer or a Gas Safe registered engineer.

Find a Gas Safe engineer

A boiler fault code alone is not a gas or carbon-monoxide emergency. If you smell gas, a CO alarm sounds, or someone has possible carbon-monoxide symptoms, leave and call 0800 111 999 from outside.

Official source: Ideal Logic MAX Heat2 User Guide · UIN 228292 A08 (07/2023) · §1.8 Display Functions – Fault Messages, code Return Thermistor Fault, printed p. 7