Status Event LED Status
D1 D2 D3 D4 D5
Normal Unit OFF/Phase 'U' or 'N' missing
Normal Power ON
Normal Compressor ON
Normal Fresh Start/Normal Start
Normal Defrost ON
Fault DLT Overlimit
Fault Ambient sensor failure
Fault MCT sensor failure
Fault DLT Thermistor failure
Fault HP Cut Out
Fault Compressor Over Current
Fault Compressor Incorrect Phase sequence
Fault Compressor Voltage Imbalance
System Liquid Floodback
Fault Compressor about to turn ON & Ambient sensor failure
On DLT Discharge Line Temperature
MCT Mid Coil Temperature
Off
Blink
Warning
Other Outputs provided by the Diagnostic Module
External Buzzer This provision is for the customer to connect an audible buzzer (another
Option that can be purchased loose) , typically within the range of 10 to 30 metres from the E2
board. The alarm is for a common fault signal (any of those listed above). Copeland should be
consulted for compatibility between the customer’s buzzer and the E2 board if buzzers other than
the option sold by Copeland are to be used.
Dialer This provision is for the customer to be able to receive a common fault signal (any of those
listed above at a remote location through the normal telephone network. The E2 communicates
with a Dialer (to supplied by Copeland in future) which communicates with the telephone network.
Liquid Floodback Warning Liquid refrigerant entering the compressor in excessive quantities can
damage the compressor by diluting the lubricant, as well as excessive stress, on several components in the
compressor. Proper control of liquid refrigerant in a system is an application problem and is beyond control
of this controller. However, controller will still perform the following checking and judgment, and alert the
user that system liquid flood back occurs and immediate field service is needed to solve the problem.
This checking is only a warning signal to user and will not terminate the system.
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