Furnace shows E05, may indicate a problem with the return temperature sensor

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

Open or shorted return NTC, Loose connector, Sensor not in contact with pipe, Control board input fault

Safety: Isolate power.

Check sensor and wiring: As described for A14, verify the sensor is correctly mounted and the wiring is intact.
Replace sensor: If visual checks are fine but E05 persists, replace the return NTC with a Beretta-approved part.

Medium 3/5

Return NTC Temperature Sensor

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