Error code

Mitsubishi Electric PUHZ code 6840

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Meaning

Indoor/outdoor unit communication error (Signal receiving error) 1 Abnormal if indoor controller board could not receive any signal normally for 6 minutes after turning the power on. 2 Abnormal if indoor controller board could not receive any signal normally for 3 minutes. 3 Consider the unit as abnormal under the following condition. When 2 or more indoor units are connected to an outdoor unit, indoor controller board could not receive a signal for 3 minutes from outdoor controller circuit boar | Indoor/outdoor unit communication error (Signal receiving error) (Outdoor unit) Abnormal if outdoor controller circuit board could not receive anything normally for 3 minutes.

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Possible causes

(1) Contact failure, short circuit or miswiring (converse wiring) of indoor/outdoor unit connecting wire (2) Defective transmitting receiving circuit of outdoor controller circuit board. (3) Defective transmitting receiving circuit of indoor controller board. (4) Noise has entered into indoor/ outdoor unit connecting wire. (5) Defective fan motor (6) Defective rush current resistor of outdoor power circuit board (1) Contact failure of indoor/outdoor unit connecting wire (2) Defective communication circuit of outdoor controller circuit board (3) Defective communication circuit of indoor controller board (4) Noise has entered into Indoor/ outdoor unit connecting wire.

Solution

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