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3) LEV, Solenoid Valve Troubleshooting Flow
No cooling
No heating
Check disconnection or looseness
of connectors.
Is there a problem?
Operate in cooling or heating (1 system
only when there are plural systems)
Cooling or heating
operation?
Heating operation
Note 1
Check if LEV 1 are fully open
LEV 1 fully open?
LEV3 are not
controlled
Check if LEV 1 are fully shut.
Yes
Note 2
No
Yes
No
Yes
No
Yes
No
Yes
Check if LEV3 is controlled by
superheat.
LEV3 is not controlled.
Check if SVM is ON.
SVM ON
Check if SVA, SVC are ON.
SVA, SVC ON
Check if SVB is OFF.
SVB OFF
Check if LEV 3 are controlled by
differential pressure.
Completion
Check SVB
Check SVA, SVC
Check SVM
Check LEV3
Correct the problem.
Check LEV1
SVB ON
Check if SVB is ON.
SVA, SVC OFF
Check if SVA, SVC are OFF.
SVM OFF
Check if SVM is OFF.
LEV 1 fully shut?
Yes
No
Note 2
No
No
No
Yes
Yes
Yes
Note 3
Note 3
No
Yes
Yes
No
*1. SVM is not built in depending on models.
*1
*1
