Fujitsu ASTG30KMTC Service Manual page 51

Check point 4. Check serial signal (Reverse transfer signal)
Check serial signal (Reverse transfer signal)
• Check if indicated value swings between AC 90 V and AC 270 V at the outdoor unit terminal 1
—3.
• If it is abnormal, check the parts below.
– Outdoor unit fan motor in
– Active filter module in
– Transistor PCB in
– Filter PCB (Check the wire)
• If outdoor fan motor is abnormal, replace outdoor unit fan motor and main PCB.
• If active filter module is abnormal, replace it.
• If transistor PCB is abnormal, replace it.
• If the checked parts are normal, replace the main PCB.
Check point 1-2. Check external cause such as noise
• Check the complete insulation of the grounding.
• Check if there is any equipment that causes harmonic wave near the power cable (Neon light
bulb or any electronic equipment which causes harmonic wave).
2-1. E: 11. Serial communication error (Serial reverse transfer error) (Outdoor unit)
GREEN
WHITE
N
BLACK
L
RED
3
WHITE
2
BLACK
1
"Service parts information"
"Service parts information"
"Service parts information"
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on page 03-75
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2. Troubleshooting with error code