Build It • DIY

📅 August 22, 2025 ⏱️ 11:45

Is your MrCool mini split not cooling or icing over? ❄️ In this step-by-step DIY mini split repair guide, I’ll show you how to quickly fix a MrCool DIY 12K mini split that’s freezing up and not cooling properly. We’ll cover: Why your mini split ices over How to check airflow and refrigerant levels Safely recharging with R410A refrigerant (with UV dye & sealant) Testing results with thermal imaging ⚠️ Disclaimer: Always use caution when handling refrigerant. If you’re not comfortable doing this, contact a licensed HVAC technician. 📌 Helpful links to refrigerant & tools are in the description below. ⏱️ Chapters 0:00 – Intro: Mini split not cooling properly 0:28 – Symptoms: Icing over & weak cooling 1:27 – MrCool DIY 12K unit overview 2:07 – Checking refrigerant type (R410A) 3:02 – Choosing refrigerant with UV dye & sealant 4:02 – Tools & safety tips (gloves, glasses, connector) 5:01 – Importance of cooling mode & low pressure side 5:34 – Outdoor inspection: Signs of low refrigerant 6:04 – Connecting refrigerant & filling process 7:13 – Results after one bottle (barely in the blue) 8:29 – Frost disappears – cooling restored 9:01 – Checking for leaks with bubble test 10:10 – Final results with thermal imaging (airflow test) 11:12 – Wrap-up & advice (order extra refrigerant bottles)