Furnace shows A14, may prevent operation or cause erratic temperature control

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

Defective return NTC sensor, Broken sensor wiring, Sensor not in proper contact with return pipe, Control board sensor circuit fault

Safety: Turn off power before working on internal wiring.

Locate return NTC: Find the sensor on the return pipe entering the heat exchanger or hydraulic block.
Check wiring and connector: Inspect the cable for cuts or abrasions. Reseat the connector on the control board.
Verify mounting: Ensure the sensor is firmly attached to the pipe or fully inserted into its pocket with thermal paste if specified.

Replace the return NTC if the fault persists. Sensor resistance should be checked by a technician using Beretta's temperature/resistance chart.

Medium 3/5

Return NTC Temperature Sensor

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