Compressor Overcurrent Interruption (Extended Operation)
Mitsubishi Electric · Mitsubishi PUZ-HA30-36NHA4 Outdoor Unit
What does UP (1100) mean?
An overcurrent condition on the DC bus or compressor is detected after the compressor has been operating for 30 seconds. This differs from UF (100) which occurs within 30 seconds of start-up. Causes can include a closed stop valve, decreased power supply voltage, loose/disconnected/reversed compressor wiring, defective indoor/outdoor fans, short cycling of units, a defective input circuit of the outdoor controller board, or a defective compressor.
Additional Steps
Steps 1–2 are listed in Priority Fix.
- 3
Correct the U·V·W phase wiring to the compressor. Refer to section 10-9 (Outdoor power circuit board).
- 4
Check the indoor/outdoor fan motors.
- 5
Solve the short cycle issue by addressing airflow obstructions or incorrect unit placement.
- 6
Replace the outdoor controller circuit board.