Status
Unit will fold-back to reduce discharge temp to a value below 200°F. IF this occurs 3 times in one call, unit will lockout.
Description
Discharge temp is either unreadable or is higher than it should be.
Expected Operation
If discharge temperature goes above 225°F, it will fold-back (slow down) the compressor in an attempt to get discharge temperature below 200°F and hold for several minutes before attempting to ramp up again. If during the span of one call, the unit will go into lockout.
Cause
1. Defective sensor or wiring to it.
2. Sensor connector not firmly seated into drive.
3. High suction superheat entering compressor cannot overcome heat internal to compressor
Solution
1. Check wiring to discharge temp sensor. Inspect for any visible missing insulation, inspect terminals for proper crimping to wire and inspect terminals in housing to confirm that they are fully seated in the connector housing.
2. Check refrigerant charge - compare pressure readings to published values for the unit at the current ambient temp. Adjust refrigerant charge level as necessary.
3. If problem persists, replace inverter drive controller.