Fujitsu AUXB04GALH Service Manual page 110

Trouble shooting 32
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
E. 28. 4 Indicate or Display:
Outdoor Unit : E. 28. 4
Indoor Unit
Error Code
Detective details:
When abnormal answer signal is input during signal amplifier auto address
04-40
: No Display
: 28