Error code

Mitsubishi Electric PAC code U4

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: 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.

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

Meaning

(TH3:5105) (TH7:5106) (TH8:5110) (63HS:5201) ( ) TH-A~E :5131: (1) Open/short circuit in the outdoor unit thermistors (TH3, TH7, and TH8) and branch box’s thermistors(TH-A~E) Abnormal if open or short circuit is detected while the compressor is operating. WCheck which unit has abnormality in its thermistor by switching the mode of SW2. (Refer to 9-8.) Open/short circuit in the branch box

Member details

Signed-in members see the LED pattern and how to read the code with the remote control on eligible records.

View details as a member

Possible causes

1One or more connectors on outdoor controller circuit board (TH3, TH7 and TH8) and branch box controller board (TH-A~E) have contact failure or disconnection. 2Defective thermistor 3Outdoor controller circuit board is defective.

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.