Ideal Return Temperature Sensor Out of Range

Ideal boiler shows C8 and may cycle or limit output

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Faulty return NTC thermistor, Loose sensor, Wiring fault, PCB sensor input issue

Safety first: Internal access must be by a Gas Safe engineer.

User action: Power cycle and reset once. If C8 persists, an engineer should test and replace the return NTC sensor and check wiring and PCB.

Hard 4/5

Return NTC Thermistor

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