LG AR-DR11-08A Installation And Operation Manual page 41

Digital Scroll Controller Error Codes
Flash Code 1 - Reserved for future use.
Flash Code 2 - High Discharge Temperature.
• The discharge temperature thermistor has measured a temperature above 268°F (130°C) or the thermistor is short circuited (jumpered out).
• The Digital Compressor Controller will de-energize the compressor contactor, unloader solenoid and vapor injection solenoid. The alarm
relay contacts will close.
• The compressor will be allowed to restart after a thirty (30) minute delay and after the thermistor temperature is below 250°F (120°C).
The flash code and alarm relay contacts will be reset after the compressor has run for sixty (60) uninterrupted minutes without any other
ALERTs. If five (5) high discharge temperature ALERTs have occurred within four (4) hours, the Digital Compressor Controller will lock out
the compressor. The lockout can only be reset by cycling the 24VAC power OFF and ON.
Flash Code 3 - Compressor Protector Trip.
• The demand signal from the system controller is greater than 1.44VDC and there is no compressor current detected. This could be due to
the compressor's internal overload protector being open, fuse or breaker open, power disconnected to compressor contactor, compressor
power wiring not run through Digital Compressor Controller current transformer port or a compressor contactor failure.
• The Digital Compressor Controller will de-energize the compressor contactor, unloader solenoid and vapor injection solenoid. The alarm
relay contacts will close.
• The Digital Compressor Controller will wait for the two (2) minute anti-short cycle timer to time out, and if the system controller demand
signal is still greater than 1.44VDC, it will energize the compressor contactor again. If compressor current is detected on the restart, the
ALERT code and alarm relay output will reset. The Digital Compressor Controller will attempt to restart compressor as long as the system
controller demand is above 1.44VDC. There is no lockout feature for this ALERT.
Flash Code 4 - Locked Rotor.
• A locked rotor condition in the compressor is sensed by the Digital Compressor Controller on four (4) consecutive start ups.
• The Digital Compressor Controller will de-energize the compressor contactor, unloader solenoid and vapor injection solenoid. The alarm
relay contacts will close.
• This code results in a lockout and can only be reset by cycling the 24VAC power off and on.
Flash Code 5 - Demand Signal Loss.
• The demand signal input has dropped below 0.5VDC. The demand input signal wire may be disconnected or the system controller providing
the signal may not be powered.
• The Digital Compressor Controller will de-energize the compressor contactor, unloader solenoid and vapor injection solenoid. The alarm
relay contacts will close.
• Once the system controller demand signal input has risen above 0.5VDC, the ALERT code and alarm relay output will reset. If the demand
signal is above 1.44VDC and the anti-short cycle timer has timed out, the compressor will restart.
Flash Code 6 - Discharge Thermistor Fault.
• The Digital Compressor Controller is not receiving a signal from the discharge temperature thermistor. The thermistor may be missing,
disconnected or a wire is broken.
• The alarm relay contacts will close and the Digital Compressor Controller will not increase the capacity of the compressor beyond 50%
loading.
• This ALERT code and alarm relay output are reset by reconnecting the thermistor.
Flash Code 7 - Reserved for future use.
REFRIGERATION SYSTEM STARTUP
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