Error code

Mitsubishi Electric CMB code 3152

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Meaning

Abnormal temperature inside the Inverter control box: 1. If the temperature inside the con70°C trol box is detected to be or more during operation (the first time it is detected), the heat source unit is stopped temporarily, the system enters the 3-minute restart prevention mode, then restarts the heat source unit after 3 minutes. 2. If the temperature inside the con70°C trol box is detected to be or more during operation (the second time it is detected) again within 30 minutes after the heat source unit stops according to 1. above, an abnormal sto

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Possible causes

(1) Cooling air passage closed. (2) Rise in the ambient temperature. (3) Faulty power transistor. (4) Faulty thermistor (5) Faulty thermistor input circuit on the control board. (6) Faulty cooling fan, connector pulled out. (7) Faulty LEV 1 for inverter cooling, connector pulled out. (8) Faulty cooling fan output circuit on the relay board. (9) Faulty cooling fan output circuit on the control board. 10)Faulty LEV 1 output circuit for inverter cooling on the control board.

Solution

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