Carrier 38VMH-1P Service Manual page 44

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P2: LOW PRESSURE PROTECTION
DEFINITION
Low pressure switch is activated for pressure ≤ 20psi
POSSIBLE CAUSES
• Stop valve is closed
• The heat exchanger is dirty or blocked
• Insufficient refrigerant in the system
• Damaged main board
• Low pressure resulted by refrigerant blocked on high pressure zone due to the damaged valve of IDU or ODU
A210286
Fig. 51 —P2 Troubleshooting Chart
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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