Error code

Mitsubishi Electric CMB code 1302

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Meaning

High pressure fault 1 (Outdoor unit): 1) If the pressure of 3.78MPa [548psi] or higher is detected by the pressure sensor during operation (the first detection), the outdoor stops once, turns to antirestart mode for 3 minutes, and restarts after 3 minutes automatically.

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Possible causes

(1) HBC controller LEV malfunction Cooling-only/Cooling-main: LEV1, 2 Heating only or heating main : Indoor LEV 1, 2, 3 Defrost : LEV1, 2, 3 (2) HBC controller SVM1 malfunction ->Cooling only or defrost (3) Water pump fault (4) 3-way valve/Water flow rate control valve fault (MV1, MV2, and FCV3) (5) Port address setting error. (6) Refrigerant service valve actuation failure (7) Short cycle on the indoor unit side (8) Clogged filter on the indoor unit (9) Reduced air flow due to dirty fan on the indoor unit fan (10) Dirty heat exchanger of the indoor unit (11) Indoor fan (including fan parts) failure or motor failure Items (6) through (11) above reduce the condensing capability of the unit, resulting in high-pressure rise during heating operation. (15) Solenoid valve (SV1a) malfunction The by-pass valve (SV1a) can not control rise in high pressure. (16) Thermistor failure (TH3, TH7) (17) Pressure sensor failure (18) Failure of the thermistor input circuit and pressure sensor input circuit on the controller board (19) Thermistor mounting problem (TH3, TH7) (20) Disconnected male connector on the pressure switch (63H1) or disconnected wire (1) Inner pressure drop due to a le

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.

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