Sinclair SCV-750EB Service Manual page 129

5.27 F2 Troubleshooting
Digital display output
Description
Insufficient protection of exhaust superheat.
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All units stop running.
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Error code is only displayed on main PCB and user interface.
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Possible causes
Discharge pipe temperature sensor connected properly or has malfunctioned.
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For SCV-750EB and SCV-1400EB, discharge pipe temperature sensor at the top of the compressor falls or is not insulated.
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For SCV-900EB and SCV-1800EB, electronic expansion valve coil not connected properly or has malfunctioned.
Damaged main PCB.
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