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AE5-1377 R3
Table 8 - Diagnostics Module Display
LED1
– Unit Status
Display Status

Idle (Set Point or Low Pressure Cut-Out Rached)

Run

About to Start
1

Defrost

Unit Trip

Unit Lockout
LED1
– Unit Status
Display Status

No error/warnings

Compressor Phase Error (Wrong Phase Sequence/Loss of
Phase)

Compressor Inside Internal Motor Protector Trip

Compressor Over Current

Discharge Gas Overheat (High Discharge Temperature)

Compressor High Pressure Cut Out

Not Used

DLT Thermistors Failure

Ambient Temperature Sensor Failure

Mid-coil Temperature Sensor Failure

PHE Vapor In Temperature Sensor Failure or over range 2

PHE Vapor Out Temperature Sensor Failure or over range
2

System Liquid Flood Back Warning
Notes:
1
This signal is for Fresh Start, Normal Start Program and any start request delay.
2 PHE Vapor In/Out Temperature Sensor is not applicable in XJAM condensing unit (MT units).
All error/warning messages are priority-ranked from highest to lowest. If unit is initially powered on, the diagnosis
module will show signal similar to the below example:
Figure 8 - Diagnostics Module Start Up Information