Lennox MPB036S4M

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29.4. Four-Way Valve
a. Poweron,useadigitaltestertomeasurethevoltage,whentheunitoperatesincooling,itis0V.Whentheunitoperates
inheating,itisabout230VAC.Ifthevalueofthevoltageisnotintherange,thePCBmusthaveproblemsandneedsto
be replaced.
Figure 78. Measure Voltage
b. Turnoffthepower,useadigitaltestertomeasuretheresistance.Thevalueshouldbe1.8~2.5KΩ.
Figure 79. Measure Resistance