Mitsubishi Electric CITY MULTI PUHY-P200YEM-A Service Handbook page 111

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?
Check if LEV 1 are fully open
LEV 1 fully open?
Yes
Check if LEV3 is controlled by
superheat.
LEV3 is not controlled.
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 SVA, SVC
No
Check SVB
Completion
No
Check if LEV 3 are controlled by
differential pressure.
No
Check if SVA, SVC are OFF.
No
No
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Note 2
Check if LEV 1 are fully shut.
LEV 1 fully shut?
Yes
Note 3
LEV3 are not
controlled
Yes
SVA, SVC OFF
Yes
Check if SVB is ON.
SVB ON
Yes