Daewoo FRS-U20FF. - 4) Troubleshooting

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4) Troubleshooting
Measure winding for open circuit between all pair of pins on the hermetic
terminal. If one winding is open, replace it by a new one.
Open compressor motor winding.
Allow the Inverter to equalize pressure between suction and discharge sides.
Unequaled pressures between discharge
and suction pressures in the refrigerating
system.
Compressor positions rotor, But fails to start
Replace compressor by a new one and test for confirmation.
Demagnetized rotor
(only if compressor was previously
connected
directly to the AC power supply).
Wait the necessary time or reset the Inverter disconnecting it from the
AC power supply. The reset time is about 15s.
Inverter on Waiting Time after failed start.
Replace compressor by a new one and test for confirmation.
Demagnetized rotor
(only if compressor was previously
connected
directly to the AC power supply).
Measure AC voltage to confirm; correct the voltage or change the Inverter
to the correct voltage range (115V or 220V model).
Too low AC voltage supplied to the Inverter.
Return the unit to manufacturer, replacing it by a new one.Blown fuse (due to previous major failure).
Verify the Control Input Cable connection and measure the signal from the
Main-PCB.
No control signal input or bad connection.
Verify the AC Input Cable connection and measure the AC Input voltage.
No AC power supply ; or wrong
voltage/wrong
Terminals connected to the Inverter.
Measure winding for open circuit between all pair of pins on the hermetic terminal.
If one winding is open, replace it by a new one.
Open compressor motor winding.
Replace compressor by a new one and test for confirmation.
Compressor with locked rotor.
(due to mechanical damage).
Replace by a new one and test for confirmation.Dropped, damaged, burnt Inverter.
Verify the Compressor Cable connection.Compressor disconnected from the Inverter
No Compressor Trial
ACTIONPROBLEM
- No Start
No or incorrect control signal.
(check if the correct control signal is arriving at the control Input Connection).
Too high compression load, with compressor being subjected to a stall
condition. (lower suction and/or discharge pressures for correction).
Too low AC voltage. Check the AC voltage supplied to the Inverter and set it
to the required level or change the Inverter to the correct voltage range.
(115V or 220V model).
Compressor does not run at the speed
selected by the Inverter.
ACTIONPROBLEM
- Malfunction during operation