Sinclair SCV-750EB Service Manual page 107

5.16 P9 Troubleshooting
Digital display output
Description
Water inlet and outlet temperature difference protection
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All units stop running.
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Error code is displayed on main PCB and user interface.

Possible causes
Temperature sensor not connected properly or has malfunctioned.
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Water piping contains air.
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Insufficient water flow.
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Main PCB damaged.
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