0P2 0H5: Low Pressure Protection - Carrier 38VMA Series Service Manual

r. 0P2 0H5: Low Pressure Protection
1. Error display:
ODU display: 0H5/0P2
2. Applicable models:
38VMA***HDS5-1 (208/230V-3Ph-60Hz)
38VMA***HDS6-1 (460V-3Ph-60Hz)
3. Error definition:
0P2 error is reported when the registered value of low pressure sensor on the main board is < 1.45 psi.
0H5 error is reported when 0P2 occurs 5 times with in a period of 100 minutes.
4. Possible causes:
•
The low pressure error is caused by lack of refrigerant in the system
•
Damaged sensor
•
Damaged main board
•
Low pressure because of refrigerant blockage on the high pressure side due to improper operation of the solenoid valve
(IDU, ODU)
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