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Run Drive Diagnostic Test
Test Response 2:
Drive HW
Cmpr Lead/Winding
Malfunction (In-
rush/PFC Fault)
Replace
Drive
WARNING
400 VOLTS
ELECTRICAL
HAZARD
Failure to follow this
warning could result in
personal injury or death.
WAIT TWO (2) MINUTES
after disconnecting power prior
to touching electrical
components as they may hold
a dangerous charge
of 400VDC, then verify DC
Voltage is less than 42 VDC
at inverter test points
labeled +VDC and -VDC before
servicing board.
+VDC
-VDC
If Ambient > 85,
disconnecting dome sensor
will force pre-heat.
Manual
Procedure
4TWL9048A-SF-1C-EN
Run Drive Diagnostic Test
Drive Test:
Passed?
No
Test Response 3:
Short
Go To
"Compressor
Verification: Short
or Earth Fault"
Troubleshooting
Flow Chart
Verify that pre-heating is functional with System idle.
A good way to verify sump heat is on is to monitor
compressor watts from the CDA on the U, V & W
currents. One leg will have twice the current of the
Wait 12 hours for pre-heat to
move liquid refrigerant out of
compressor or remove
Run Drive Diagnostic Test
Test Response 1:
Yes
No Fault Found
Test Response 4:
Cmpr Lead/Winding
Open
Go To
"Compressor
Verification: Open"
Troubleshooting
Flow Chart
Y es
Passed: No Fault
Test Response 5:
Compressor Rotor
Malfunction
First Time
through drive
test?
No
Replace
Compressor
37
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