Sinclair SCV-750EB Service Manual page 110

5.18 PC Troubleshooting
Digital display output
Description
Water side heat exchanger low pressure protection.
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All units stop running.
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Error code is displayed on main PCB and user interface.
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Possible causes
 Low pressure switch not connected properly or has malfunctioned.
 Insufficient refrigerant.
Low pressure side blockage.

Poor evaporator heat exchange in heating mode.

Insufficient water flow in cooling mode.
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Main PCB damaged.
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