Error Code 84

Compressor motor is jammed and cannot run

Also displayed as: 84

What This Means

Compressor mechanical lock — internal bearings seized; Compressor motor winding shorted or open; Insufficient voltage to motor; Inverter not providing proper PWM signals; Refrigerant over-pressurized

First Thing to Check

Parts Involved

How to Fix

1. 1

   1. Listen for buzzing sound from compressor (indicates stall attempt)

2. 2

   2. Check DC voltage to compressor — should be 240V+ AC from inverter

3. 3

   3. Use oscilloscope to verify PWM drive signal from Inverter PCB

4. 4

   4. Check for oil movement through sight glass (if equipped)

5. 5

   5. Measure compressor winding resistance (power off) — should be 2-5 ohms per phase

6. 6

   6. If winding is open or shorted, compressor requires replacement