[8-9 Troubleshooting Problems with Major Components on HBC ]
8-9-3
Troubleshooting Flowchart for LEVs, Solenoid Valves, and Valve Blocks
(1) LEV
No cooling capacity
No heating capacity
Check whether the electric expansion
valve and the solenoid valve connector
are not disconnected or not loose.
Fault is found.
Run the cooling operation or the heating
operation in the system in trouble
(only in one system).
Cooling-only or Heating-only
Cooling-only
Check that SV1 is ON.
SV1 ON
YES
Check that LEV1 and 2 are
controlling the superheat.
Superheat control OK
YES
Check whether LEV3 is controlling
superheat.
Superheat control OK
YES
Check that VB3 is in the
standard position.
VB3:
standard position
YES
Check that VB3 is controlling the
water temperature difference.
Water temperature control OK
YES
BS_08_L
NO
Repair the fault.
Heating-only
NO
Note 1
NO
Check LEV1.
Note 1
NO
Check LEV3.
NO
NO
Completed
NO
Check SV1.
NO
NO
NO
Check VB3.
NO
Check VB3.
Check that SV1 is OFF.
SV1 OFF
YES
Note 1
Subcool control OK
YES
Note 1
Check that LEV3 is fully open.
LEV3: fully open
YES
Check that VB3 is in the
standard position.
VB3:
standard position
YES
Check that VB3 is controlling the
water temperature difference.
Water temperature control OK
YES
chapter 8 -
37
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