Mitsubishi City Multi PURY-P400 Service Handbook page 96

3) LEV, Solenoid Valve Troubleshooting Flow Chart
No cooling
No heating
Check for disconnected or loose
connectors.
Is there a problem?
Operate in cooling or heating (1 system
only when there are plural systems)
Cooling or heating
operation?
Check if LEV 1 is fully open
LEV 1 fully open?
Yes
Check if LEV3 is controlled by
superheat.
LEV3 is controlled.
Yes
Check if SVM1 is ON.
SVM1 ON
Yes
Check if SVA, SVC are ON.
SVA, SVC ON
Yes
Check if SVB is OFF.
SVB OFF
Yes
Note 1
Yes
Correct the problem.
Heating operation
Note 2
No
Check LEV1
Note 3
No
Check LEV3
No
Check SVM1
No
Check SVA, SVC
No
Check SVB
Completion
–95–
Check if LEV 1 is fully closed.
No
Is LEV 1 fully
closed?
Yes
Check if LEV 3 are controlled by
differential pressure.
No
LEV3 are not
controlled
Yes
Check if SVM1 is OFF.
No
SVM1 OFF
Yes
Check if SVA, and SVC are OFF.
No
SVA, SVC OFF
Yes
Check if SVB is ON.
No
SVB ON
Yes
Note 2
Note 3