Error code

Mitsubishi Electric PUHZ code U9

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

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

Meaning

01 02 04 08 | Detailed PFC error (Overvoltage/ codes Undervoltage/Overcurrent) • PFC detected any of the followings a) Increase of DC bus voltage to 420V.

Member details

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Possible causes

Overvoltage error 1 Abnormal increase in power source volt- • Increase in DC bus voltage to age SW75VHA: 420V Disconnection of compressor wiring 2 SW100, 120VHA: 400V 3 Defective outdoor power circuit SW100, 120YHA(R1): 760V board (4) Compressor has a ground fault. Undervoltage error 1 Decrease in power source voltage, • Instantaneous decrease in DC instantaneous stop. bus voltage to 2 Disconnection or loose connection of SW75, 100, 120VHA: 200V CN52C on the outdoor power circuit SW100, 120YHA(R1): 350V board/controller circuit board (SW100, 120VHA) (3) Disconnection or loose connection of CN52C on the outdoor noise filter circuit board/controller circuit board (SW75VHA) (4) Defective converter drive circuit in outdoor power circuit board (SW·VHA) (5) Defective 52C drive circuit in outdoor power circuit board (SW100, 120V/ YHA(R1)) (6) Defective 52C drive circuit in outdoor noise filter circuit board (SW75) (7) Defective outdoor converter circuit board (SW·YHA(R1)) (8) Disconnection or loose connection of rush current protect resistor RS (SW·YHA(R1)) (9) Defective rush current protect resistor RS (SW·YHA(R1)) (0) Disconnection or loose connection of main smoothing capacitor CB (SW100,120VHA) (1) Disconnection or loose connection of CN2 on the outdoor power circuit board /controller circuit board (SW100,120V

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.