Sinclair SCV-750EB Service Manual page 118

5.22 PU/FF Troubleshooting
Digital display output
Description
1PU/FF indicates fan A module protection.
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2PU/FF indicates fan B module protection.
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FF indicates PU protection has displayed 10 times. When a FF occurred, a manual system restart is required before the
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system can resume operation.
All units stop running.
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Error code is only displayed on the main PCB and user interface.
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Possible causes
 Switch SW1 incorrectly set.
 Power or communication wires not connected properly.
Fan motor blocked or has failed.
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Power supply abnormal.
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AC filter board damaged.
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Fan module damaged.
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Inverter module PCB damaged.
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