Hunter Fan R410A manual Power transistor module including drive circuit check method, Is the power

Power transistor module (including drive circuit) check method

Is the power

transistor module cracked or burnt?

YES

Is there a

short circuit between the power transistor module terminals? ❇1

YES

Compressor operation

Is the balance between the compressor current phases good?

YES

Normal

NO

NO

NO

If there is a 10% or greater difference in the current in different phases.

(except during acceleration or deceleration)

Replacement control PCB

❇1 Power transistor module terminal short circuit check procedure

Disconnect the compressor wiring, then conduct a short circuit check. P-U, P-V, P-W

N-U, N-V, N-W

Check between the P-N terminals.

Bring the tester probes in contact with the following places on each terminal.

P: Power transistor P terminal,	U: End of red harness to compressor
N: Power transistor N terminal,	V: End of white harness to compressor
	W: End of black harness to compressor

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