Carrier 38VMA Series - 0 P1: Discharge Temperature Switch or High Pressure Protection

q. 0P1: Discharge Temperature Switch or High Pressure Protection
1. Error display:
ODU display: 0P1
2. Applicable models:
38VMA***HDS5-1 (208/230V-3Ph-60Hz)
38VMA***HDS6-1 (460V-3Ph-60Hz)
3. Error definition:
• Operation of discharge temperature switch (the detected discharge temperature > 239 °F)
• The detected pressure of high pressure sensor > 565.6 psi
4. Possible causes:
• High pressure due to excess refrigerant in the system
• High compressor discharge temperature caused by lack of refrigerant in the system
• Damaged main board
• Improper operation of sub-cooler valve resulting in the loss of cooling function
• Low pressure resulted due to refrigerant blockage on high pressure side resulting in solenoid valve error (IDU, ODU)
• Improper operation of relief valve on the refrigerant system due to the solenoid valve error (IDU, ODU)
• The high pressure is too high and the low pressure is too low because of blockage in the system
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