U7 - 3 red flashes, 1 green flash — Low discharge superheat

What does U7 mean?

This error suggests the discharge superheat is too low, meaning the refrigerant may not be properly absorbing heat. Check the TH4 reading and LEV operation.

• Incorrect TH4 reading
• LEV (Liquid Expansion Valve) malfunction
• Refrigerant charge issue
• Poor heat absorption

Click steps to track your progress.

1. 1

   Verify the TH4 thermistor reading is accurate.

2. 2

   Check the operation of the LEV.

3. 3

   Ensure the refrigerant charge is correct (requires professional).

4. 4

   Inspect airflow across the evaporator coil.