OK
OK
OK
1. Indoor unit power supply defective 2 Indoor unit overconnected
3.Communication line incorrect connection 4. Noise, momentary open
Outdoor unit Main PCB
Check Point 1 : Check the indoor unit power supply
Check the indoor unit power supply
Check Point 2 : Check the indoor unit number connection
Check if more than 64 indoor units are connected in a refrigerant circuit
Is it uncoupled or cut halfway ?
Connecting terminal position is correct as the installation manual shows ?
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
Check Point 3 : Check the communication line connection
Indoor Unit : No Display
Outdoor Unit : E. 28. 1
Error Code : 28
04-69(01)
Auto Address Setting Error
When none of the connected indoor units answers during auto address
And when abnormal answer signal is input.
Trouble shooting 61
Indicate or Display:
Detective Actuators:
Detective details:
UTDOOR UNIT Error Method:
Forecast of Cause :
OK
OK
OK
1. Signal amplifier power supply defective 2. Signal amplifier overconnected
3. Signal amplifier auto address wrong setting 4. Noise, momentary open.
Outdoor unit Main PCB
Check Point 1 : Check signal amplifier unit power supply
Check signal amplifier unit power supply
Check Point 2 : Check the signal amplifier number connection
Check if more than 8 signal amplifiers are connected in a network
Check if signal amplifier auto address is set at the same time from multiple
outdoor units (master unit)
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
Check Point 3 : Check the operation of signal amplifier auto address setting
Indoor Unit : No Display
Outdoor Unit : E. 28. 4
Error Code : 28
Signal Amplifier Auto Address Error
When abnormal answer signal is input during signal amplifier auto address
Trouble shooting 62
Indicate or Display:
Detective Actuators:
Detective details:
UTDOOR UNIT Error Method:
Forecast of Cause :
Check if communication line is correctly connected
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