AC08 and AC12 Operations Manual....
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8.2 FAILURE AND WARNING MESSAGES
The converter can display various FAILURE or WARNING messages under certain circumstances.
If the event causing such as message has subsided, pressing buttons F1 (8) and F2 (9) simultaneously
will clear the FAILURE or WARNING message. Common messages are:
D86 LVDC FAULT (low voltage power supply fault)
INPUT POWER CORRUPT (control power to the computer has dropped out of range)
INV_X_OT (the output Inverter circuit has exceeded its max. temp.)
PFC_X_OT (the input PFC circuit has exceeded its max. temp.)
XFMR_OT (the input transformer has exceeded its max. temp.)
If either the D86 LVDC FAULT or INPUT POWER CORRUPT message appears and cannot be
cleared, please turn the converter completely OFF using its red/yellow disconnect switch and contact
an authorized service center or the factory for assistance. Leaving the red/yellow disconnect switch
in the ON position with these messages present could cause further damage to the converter.
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