Mitsubishi Electric PUHY-200YMF-B Service Handbook page 120

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?
Cooling operation
Check if LEV4 is fully shut.
LEV 4 fully shut?
Yes
Check if LEV 1, 2 are fully open
LEV 1, 2 fully open?
Yes
Check if LEV3 is controlled by
superheat.
LEV3 is not controlled.
Yes
Check if SVM is ON.
SVM ON
Yes
Check if SVA, SVC are ON.
SVA, SVC ON
Yes
Check if SVB is OFF.
SVB OFF
Yes
*There are not LEV2 and LEV4 on CMB-P-V-E.
Note 1
Yes
Correct the problem.
Heating operation
Note 2
No
Check LEV4
Note 2
No
Check LEV1, 2
Note 3
No
Check LEV3, (4)
No
Check SVM
No
Check SVA, SVC
No
Check SVB
Completion
–118–
Check if LEV 1, 2 are fully shut.
No
LEV 1, 2 fully shut?
Yes
Check if LEV 3, 4 are controlled by
differential pressure.
No
LEV3, 4 are not
controlled
Yes
Check if SVM is OFF.
No
SVM OFF
Yes
Check if SVA, SVC are OFF.
No
SVA, SVC OFF
Yes
Check if SVB is ON.
No
SVB ON
Yes
Note 2
Note 3