Emerson COPELAND ZX Series - Alarm Codes: Electrical Errors; Electrical Error Diagnostics

2
5
Alarm
Code
Description Possible Reason Action Reset
Electrical Error
E20 Missing phase alarm
One or two phases of compressor
power supply lost or Voltage sensors
do not work (3-ph unit only)
The compressor will be tripped Automatically with time delay
L20 Missing phase lock
Missing phase alarm happened
frequently
The compressor will be tripped
and the unit will be locked
Press “Start” >5 sec or manually
power-off and power-on
L21 Wrong phase sequence lock
Compressor power supply has
wrong sequence (3-phase unit only)
The compressor will be tripped
and the unit will be locked
Press “Start” >5 sec or manually
power-off and power-on
E22
Imbalanced 3-phase
warning
3-Ph currents are not balanced
(3-Ph unit only)
No Automatically with time delay
E23 Over current alarm
Compressor current is larger than
settings
The compressor will be tripped Automatically with time delay
L23 Over current lock
Over current alarm happens fre-
quently
The compressor will be tripped
and the unit will be locked
Press “Start” >5 sec or manually
power-off and power-on
E24
Compressor running circuit
open alarm
Compressor running circuit open
(1-ph unit only)
The compressor will be tripped Automatically with time delay
L24
Compressor running circuit
open lock
Running circuit open alarm happens
frequently
The compressor will be tripped
and the unit will be locked
Press “Start” >5 sec or manually
power-off and power-on
E25
Compressor starting circuit
open alarm
Compressor starting circuit open
(1-ph unit only)
The compressor will be tripped Automatically with time delay
L25
Compressor starting circuit
open lock
Compressor starting circuit open
alarm happens frequently
The compressor will be tripped
and the unit will be locked
Press “Start” >5 sec or manually
power-off and power-on
E26 Low voltage alarm
Voltage is lower than settings; or
voltage sensors do not work
The compressor will be tripped Automatically with time delay
L26 Low voltage lock
Low voltage alarm happens fre-
quently
The compressor will be tripped
and the unit will be locked
Press “Start” >5 sec or manually
power-off and power-on
E27 Over voltage alarm Voltage is higher than settings The compressor will be tripped Automatically with time delay
L27 Over voltage lock
Over voltage alarm happens
frequently
The compressor will be tripped
and the unit will be locked
Press “Start” >5 sec or manually
power-off and power-on
E28
Compressor internal protec-
tor open warning
Compress internal protector is open;
or current sensors do not work
No The compressor will be tripped
E30
No controller power supply
alarm
Controller lost power supply