Error code

Mitsubishi Electric MXZ code 4220

For your safety

This fault is rated critical. No remote repair or do-it-yourself instructions are given; do not use the appliance or try to open or repair it.

Hazard area: mains voltage and refrigerant gas circuit

If there is a risk to life, first move to a safe place, then call 112. Do not follow remote repair instructions.

Call 112

The emergency numbers here are for Turkey. If you are outside Turkey, call your local emergency number.

All emergency numbers and province details

No approved translation for this record yet; showing the original text.

Meaning

To find out the details about U9 error, Detailed Refer to "8-8. FUNCTION OF SWITCHES, codes Overvoltage error • Increase in DC bus voltage to; V model: 400V Y model: 760V 01 Undervoltage error • Instantaneous decrease in DC bus voltage to; V model: 200V Y model: 350V 02 | Detailed Input current sensor error/ codes L1-phase open error • Decrease in input current through outdoor unit to 0.1A only if operation frequency is more than or equal to 40Hz or compressor current is more than or equal to 6A. 04 Abnormal power synchronous signal • No input of power synchronous signal to power circuit board • Power synchronous signal of 44 Hz or less, or 65 Hz or 08 more is detected on power circuit board. PFC/IGBT error (Undervoltage) • When Compressor is running, 20 DC bus v

Member details

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Possible causes

(1) Abnormal increase in power source voltage (2) Disconnection of compressor wiring (3) Defective outdoor power circuit board (4) Compressor has a ground fault. (1) Decrease in power source voltage, instantaneous stop.

Solution

Solution steps are not shared for faults that may be dangerous.

No do-it-yourself solution is given for this fault. For your safety, call an authorised service.