Sinclair SCV-750EB Service Manual page 114

5.20 PE Troubleshooting
Digital display output
Description
Water side heat exchanger low temperature antifreeze 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
Temperature sensor not connected properly or has malfunctioned.
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Insufficient refrigerant.
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Low pressure side blockage.
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Poor evaporator heat exchange in heating mode.
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Insufficient water flow in cooling mode.
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Main PCB damaged.
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