38MARB: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
52
4 - Way Valve Check
1. Power on, use a digital tester to measure the voltage; when the unit operates in the COOLING mode, the voltage is 0V. If the voltage value is not in
range, the PCB is faulty and needs to be replaced.
Fig. 39 — Measure the voltage
2. Turn off the power, use a digital tester to measure the resistance. The value should be 1.8~2.5 K
Fig. 40 — Use a digital tester to measure resistance
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