The PIC will not allow calibration if the transducer is too far out of calibration. A new transducer must be installed and recalibrated.

Transducer Replacement

Since the transducers are mounted on Schrader-type fittings, there is no need to remove refrigerant from the vessel. Disconnect the transducer wiring by pulling up on the locking tab while pulling up on the weather-tight connecting plug from the end of the transducer. Do not pull on the transducer wires. Unscrew the transducer from the Schrader fitting. When installing a new transducer, do not use pipe sealer, which can plug the sensor. Put the plug connector back on the sensor and snap into place. Check for refrigerant leaks.

WARNING ! WARNING

Make sure to use a backup wrench on the Schrader fitting whenever removing a transducer.

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Carrier PC211 specifications Transducer Replacement