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[ IX Troubleshooting ]
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HWE09080 GB
Check whether the BC board output signal corresponds with the solenoid valve operation correspond.
1) SVA, SVB, SVC
SVA, SVB, and SVC turn on or off according to the indoor unit operation mode.
SVM1, SVM1b, SVM2, SVM2b
SVM1, SVM1b, SVM2, and SVM2b turn on or off according to the indoor unit operation mode.
2) SVA, SVB, SVC
Measure the temperature at the upstream and downstream pipes and of SVA.
Measure the temperature at the upstream and downstream pipes and of SVB.
Mode
Cooling Heating Stopped Defrost Fan
Port
SVA ON OFF OFF OFF OFF
SVB OFF ON OFF OFF OFF
SVC ON OFF OFF OFF ON
Operation
mode
Cooling only Cooling main Heating only Heating main Defrost Stopped
SVM1,SVM1b ON
Pressure dif-
ferential con-
trol OFF or
ON
OFF OFF ON OFF
SVM2,
SVM2b
OFF OFF
Pressure dif-
ferential con-
trol OFF or
ON
Pressure dif-
ferential con-
trol OFF or
ON
OFF OFF