Fujitsu AUUH18LUAS Service Manual page 121

¢ Models: AOUH24LUAS1, AOUH30LUAS1, and AOUH36LUAS1
Check point 1. Check the terminal connection.
• Check the following terminal connections of the compressor. (Loosening or incorrect wiring.)
R (U): Red
S (V): →hite
C (W): Black
• Check the following terminal connections of the Main PCB. (Loosening or incorrect wiring.)
P400 (U): Red
P401 (V): →hite
P402 (W): Black
Check point 2. Check the winding resistance.
Check the winding resistance of each terminal.
Resistance value
• 24 model: 1.160 Ω ±8% at 68°F (20°C)
• 30/36 model: 1.120 Ω ±8% at 68°F (20°C)
C(W)
If the resistance value is 0 Ω or infinite, replace the compressor.
Check point 3. Replace the Inverter PCB.
If check point 1 to 2 do not improve the symptom, replace the Inverter PCB.
4-2. Inverter compressor
Main PCB
Main PCB
Red
RED
R(U)
WHITE
S(V)
BLACK
- (03-55) -
S (V) C (W)
R (U)
(U) (V) (W)
Black
White
Compressor
4. Service parts information