Auto Address Setting Error; Signal Amplifier Auto Address Error - Fujitsu Airstage J-II Service Manual

Trouble shooting 46
OUTDOOR UNIT Error Method:

Auto Address Setting Error

Detective Actuators:
Outdoor unit Main PCB
1. Indoor unit power supply defective 2 Indoor unit overconnected
Forecast of Cause :
3.Communication line incorrect connection 4. Noise, momentary open
Check Point 1 : Check the indoor unit power supply
Check the indoor unit power supply
OK
Check Point 2 : Check the indoor unit number connection
Check if more than 64 indoor units are connected in a refrigerant circuit
OK
Check Point 3 : Check the communication line connection
Check if communication line is correctly connected
Is it uncoupled or cut halfway ?
Connecting terminal position is correct as the installation manual shows ?
OK
Check Point 4 : Check noise, momentary open, voltage drop
Check if power supply temporarily stops by outages or if strong noise is generated from
surrounding environment during auto address
Trouble shooting 47
OUTDOOR UNIT Error Method:

Signal Amplifier Auto Address Error

Detective Actuators:
Outdoor unit Main PCB
1. Signal amplifier power supply defective 2. Signal amplifier overconnected
Forecast of Cause :
3. Signal amplifier auto address wrong setting 4. Noise, momentary open.
Check Point 1 : Check signal amplifier unit power supply
Check signal amplifier unit power supply
OK
Check Point 2 : Check the signal amplifier number connection
Check if more than 8 signal amplifiers are connected in a network
OK
Check Point 3 : Check the operation of signal amplifier auto address setting
Check if signal amplifier auto address is set at the same time from multiple
outdoor units (master unit)
OK
Check Point 4 : Check noise, momentary open, voltage drop
Check if power supply temporarily stops by outages or if strong noise is generated from
surrounding environment during signal amplifier auto address
Indicate or Display:
Outdoor Unit : E. 28. 1
Indoor Unit : No Display
Error Code : 28
Detective details:
When none of the connected indoor units answers during auto address
And when abnormal answer signal is input.
Indicate or Display:
Outdoor Unit : E. 28. 4
Indoor Unit : No Display
Error Code : 28
Detective details:
When abnormal answer signal is input during signal amplifier auto address
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