Mitsubishi Electric CITY MULTI CMB-WP1016V-GA1, Service Handbook

Page: 181 / 294

[
VIII
Troubleshooting ]
- 172 -
HWE1410A GB
3. Troubleshooting flow chart for LEV, Solenoid valve, and Valve block
(1) LEV
1) Refer to Chapter "Control" for superheat, subcool, and water temperature difference.
Check that LEV1 and 2 are
controlling the subcool.
Cooling-only or Heating-only
Heating-only
Check VB3.
Check VB3.
Subcool control OK
Check that LEV3 is fully open.
YES
NO
Cooling-only
LEV3: fully open
YES
NO
YES
YES
NO
Check that VB3 is in the
standard position.
Check that VB3 is controlling the
water temperature difference.
VB3:
standard position
Water temperature control OK
Check that VB3 is in the
standard position.
Check that VB3 is controlling the
water temperature difference.
VB3:
standard position
Water temperature control OK
YES
YES
YES
YES
NO
NO
Check that SVM1 is ON.
Check SVM1.
SVM1 ON
Check that SVM1 is OFF.
SVM1 OFF
YES
NO
YES
NO
NO
NO
NO
Check whether the electric expansion
valve and the solenoid valve connector
are not disconnected or not loose.
Run the cooling operation or the heating
operation in the system in trouble
(only in one system).
No cooling capacity
No heating capacity
Repair the fault. Fault is found.
Note 1
Note 1
Note 1
Note 1
NO
Check that LEV1 and 2 are
controlling the superheat.
Check LEV1.
Check LEV3.
Superheat control OK
Check whether LEV3 is controlling
superheat.
Superheat control OK
Completed
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