Lev, Solenoid Valve Troubleshooting Flow - Mitsubishi Electric PUHY-200YMF-C Service Handbook

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
*1
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
*1. SVM is not built in depending on models.
Note 1
Yes
Correct the problem.
Heating operation
Note 2
No
Check LEV1
Note 3
No
Check LEV3
No
Check SVM
No
Check SVA, SVC
No
Check SVB
Completion
–108–
Check if LEV 1 are fully shut.
No
LEV 1 fully shut?
Yes
Check if LEV 3 are controlled by
differential pressure.
No
LEV3 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
*1