U7 (1500) - Superheat due to low discharge temperature trouble

What does U7 mean?

This error indicates an issue with the refrigerant superheat, specifically due to an abnormally low discharge temperature from the compressor. The Mitsubishi Electric PUMY Air Conditioner system will automatically cease operating.

• Refrigerant undercharge or leakage
• Incorrectly closed valve in cooling mode
• Malfunction of the electronic expansion valve

Click steps to track your progress.

1. 1

   Note the error code displayed on the remote controller or outdoor unit.

2. 2

   Power off the Mitsubishi Electric PUMY Air Conditioner system at the main electrical breaker.

3. 3

   Wait for at least 30 seconds, then restore power to the system.

4. 4

   If the error persists, contact a qualified service technician, as this often relates to refrigerant levels or valve operation.