How can I check the refrigerant level in my Panasonic Inverter AC to diagnose an 'UE' error?

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Grade: Education Subject: Support
How can I check the refrigerant level in my Panasonic Inverter AC to diagnose an 'UE' error?
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Checking refrigerant levels requires specialized equipment and knowledge. It's crucial to hire a certified HVAC technician to safely and accurately measure the refrigerant charge. Attempting to do this yourself can be dangerous and may void your warranty.