Error code

Mitsubishi Electric PQRY code 6843

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Meaning

A control communication start bit detection error: Indoor/heat source unit communication error (Signal receiving error) Abnormal if indoor controller board could not receive any signal normally for 6 minutes after turning the power on. Abnormal if indoor controller board could not receive any signal normally for 3 minutes. Consider the unit as abnormal under the following condition. When 2 or more indoor units are connected to a heat source unit, indoor controller board could not receive a signal for 3 minutes from heat source controller circ

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Possible causes

(1) Contact failure, short circuit or miswiring (converse wiring) of indoor/heat source unit connecting wire (2) Defective transmitting receiving circuit of heat source controller circuit board. (3) Defective transmitting receiving circuit of indoor controller board.

Solution

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