Mitsubishi Split System SUZ-AA30NLH-U1

Is the outside temperature 68°F (20°C) or below?

Ensure the pre-heat control is turned ON if the temperature is 68°F (20°C) or below.

Measure the power consumption of the compressor when pre-heat control is ON.

Cut the JK wire of the inverter P.C. board to activate the pre-heat control.

Refer to '11-6. TEST POINT DIAGRAM AND VOLTAGE' for guidance.

Check the Jumper wires on the inverter P.C. board after replacement and adjust if necessary.

Select the desired function from Table 1 using the remote controller

Adjust the defrost finish temperature setting

Confirm the new temperature setting on the remote controller display

Verify that the air conditioner responds to the new setting

Electrical Components Specification Check

Manufacturer's Guidelines Compliance

Consult Manufacturer's Technical Department

Ventilation Machinery and Outlets

Refrigerating Pipe and Components Position

Ensure capacitors are discharged safely to avoid sparking

Check for exposed live electrical components and wiring during system operations

Verify continuity of earth bonding

Is there any fault that could compromise safety?

If a fault exists, ensure no electrical supply is connected until resolved

If the fault cannot be corrected immediately, implement an adequate temporary solution

Report the fault and temporary solution to the equipment owner

Ensure no potential sources of ignition are present

Confirm that no halide torch or naked flame detectors are used

Calibrate electronic leak detector in a refrigerant-free area

Ensure detector is not a potential source of ignition and is suitable for the refrigerant used

Set leak detection equipment to a percentage of the LFL of the refrigerant

Confirm the appropriate percentage of gas (25% maximum) is set