9 year old Rheem Prestige central AC system, outdoor unit not coming on. ICC board error L21 explained. Low Pressure and How to Add Sealant to the central ac system and charge system to 10 degrees of sub cooling.

Thoughts and feedback appreciated. Closest to honestly guess pounds of R410A to the system will win the #giveaway of a 2022 Pipe Doctor/Bosch Summer Tee-Shirt and a Pipe Doctor Flexfit hat!

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