Compressor Status
Description
Trigger Method
Troubleshooting
faults.
Recommendation:
l
Ensure the liquid motor-cooling line has sufficient liquid supply and is not blocked.
l
Prevent prolonged operation at a pressure ratio less than 1.5.
o
Low Lift operation requires additional considerations, refer to Applications
Manual
l
Verify the solenoids are operational and not blocked. Refer to Section 4.6.3 Solenoid
Verification on page 73.
l
Verify the solenoid actuators. Refer to Section 4.6.3 Solenoid Verification on page 73.
l
Verify the Serial Driver. Refer to Section 4.26.3 Serial Driver Verification on page 217.
l
Verify cavity temperature sensor. Refer to Section 4.31.3 Cavity Temperature Sensor
Verification on page 242.
Low Leaving Fluid
Temperature Fault
DFT
l
(Removed from CC 4.X.X software)
l
Suggests insufficient evaporator fluid flow or insufficient system load.
l
Check evaporator fluid flow and system load.
l
Verify leaving fluid temperature sensor.
l
Ensure LEAVE jumper is installed on the I/O board.
l
Review the fault log for entering and leaving air/water temperature (if available) and
other conditions that are recorded at the time of fault.
High Pressure Ratio
Fault
AFT
l
Suggests the condenser ressure is high, not enough load on the evaporator, or
insufficient water/air flow in either condenser or evaporator.
l
Check the electronic expansion valve (EXV) operation, condenser, evaporator loads, and
water/air flow.
l
Review the fault log for suction and discharge pressures and other conditions that are
recorded at the time of fault.
Bearing/Motor Fault
Active
INS
l
If a Motor Fault type or a Bearing Fault type is present, the Bearing/Motor Fault is
triggered.
l
This is not an actual fault, only an indication that a fault has occurred in the Motor or
Bearing section. Refer to Table 5-8 Motor/System Status on page 260 and Table 5-5
Bearing Fault Types on page 254.
Sensor Fault
RFT
l
Review fault log for indication of values out of specified ranges recorded at time of fault.
Verify the questionable sensor and related connections for failure.
l
Inverter temperature: The sensor embedded in the Inverter requires a replacement of
the Inverter if determined faulty.
l
Cavity Temperature: Refer to Section 4.31.3 Cavity Temperature Sensor Verification on
page 242.
l
Suction Temperature: Verify suction pressure/temperature sensor. Refer to Section 4.32.3
Pressure/Temperature Sensor Verification on page 246.
l
Discharge Temperature: Verify discharge pressure/temperature sensor. Refer to Section
4.32.3 Pressure/Temperature Sensor Verification on page 246.
l
Leaving Water Temperature: Verify LEAVE jumper is installed on I/O board.
l
Suction Pressure: Review fault log for recorded value.
l
Discharge Pressure: Review fault log for recorded value.
High SCR
Temperature Fault
AFT
Removed from CC 4.2.X and later software
l
Indicates the SCR cooling is insufficient.
l
If this fault occurs three times within a 30-minute period, a Lock-Out Fault will occur.
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