Sinclair SDV 6 Service Manual page 110

8.1.40 P31/P34 - Fan drive board AC side overcurrent protection
Error display
Error impact
Error trigger
Error recovery
Possible cause
Troubleshooting
8.1.41 P52 - The voltage of the power supply is too low
Digital display
The faulty IDU stops. Other IDUs of the same system: operate normally.
ODU of the same system: operate normally.
 P31: The current value detected on the AC side of the fan drive board exceeds the programmed
overcurrent protection value
 P34: Six P31 failures within an hour.
 P31: Automatic recovery
 P34: Power-on again
 The actual static pressure resistance of the indoor unit outlet is less than the static pressure value
of indoor unit
 Instantaneous power failure or violent voltage fluctuation
 Indoor unit fan driver board is damaged
 Indoor unit main control board is damaged
P31/P34
Note 1:
When replacing the fan drive board, the following should be noted: For models where the fan drive board
is integrated and soldered onto the main control board, if either the fan drive board or the indoor unit
main control board is damaged, the entire control board needs to be replaced."
Panel, display box, and wired controller
Cause 1:The actual static
pressure resistance of the
indoor unit outlet is less
than the static pressure
value of indoor unit
Cause 2:Instantaneous
power failure or violent
voltage fluctuation
Cause 3:If the error
cannot be cleared after all
other cause have been
eliminated, the main
control board or fan drive
board is damaged
Display position
Use control to set the
static pressure value of
indoor unit
Power-on again, check whether
the power supply voltage is
stable, if the fluctuation is
violent, the power supply needs
to be rectified
Replace the main control
board or fan drive board
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