38MGRBQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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4. 4-Way Valve
a. Power on, use a digital tester to measure the voltage, when the unit operates in the COOLING mode, it is 0V. When the unit operates in the
HEATNG mode, it is about 230VAC. If the value of the voltage is not in the range, the PCB is faulty and needs to be replaced.
b. Turn off the power, use a digital tester to measure the resistance. The value should be 1.8~2.5 KÙ.
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