Sinclair SDV5 Series Service Manual page 57

2.14.5 Procedure
Power off for 3 minutes, and pull up the
DC fan motor connection port, repower
on to confirm whether the fault is cleared
Confirm whether the connection is well
between CN52 and CN53
LED301/LED302/LED303 is off
Test the 310V DC output voltage of CN53
port to confirm whether the voltage is
ODU main control board malfunction
2.15 H7: Number of indoor unit detected is increase or decrease (For all models)
2.15.1 Digital display output
H7
2.15.2 Description
 Number of indoor unit detected is increase or decrease protection.
 The system stops running.
 Error code is displayed on the unit with the error.
2.15.3 Trigger / recover condition
 Trigger condition: Number of indoor unit detected is increase or decrease.
 Recover condition: Number of indoor unit detected is the same as first power on.
 Reset method: Resume automatically.
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H0
No
Confirm whether
Yes
normal
No
Yes
DC fan motor malfunction
External disturbance, maintain to use
Power off for 3 minutes, then repower on
No
to check whether fault is cleared
Test the AC voltage between CN502(N
No
port) and CN501(L port) to confirm
whether the voltage is over 160V
Yes
Break the L and N port connection wire
and test the voltage between red wire
Yes
and black wire, confirm whether the
voltage is 220V
Filter board damaged (100/120 model
can ignore this step for no filter board)
Yes
No
No