Error code

Mitsubishi Electric PUHZ code EA

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Meaning

Miswiring of Interface unit/Flow temp. controller-outdoor unit connecting wire 1. Outdoor controller circuit board can automatically check the number of connected Interface unit/Flow temp. controller. Abnormal if the number cannot be checked automatically due to miswiring of Interface unit/Flow temp. controller-outdoor unit connecting wire and etc. after power is turned on for 4 minutes. 2. Abnormal if outdoor controller circuit board recognizes excessive number of Interface unit/Flow temp. cont

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Possible causes

(1) Contact failure or miswiring of Interface unit/Flow temp. controller-outdoor unit connecting wire (2) Diameter or length of Interface unit/Flow temp. controlleroutdoor unit connecting wire is out of specified capacity. (3) Excessive number of Interface unit/Flow temp. controller is connected to 1 outdoor unit. (2 units or more) (4) Defective transmitting receiving circuit of outdoor controller circuit board (5) Defective transmitting receiving circuit of Interface/ Flow temp. controller board (6) Noise has entered into power supply or Interface/Flow temp. controller-outdoor unit connecting wire.

Solution

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