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 : No Display
* Service tool does not indicate the Error code
Auto Address Setting Error
When none of the connected indoor units answers during auto address
And when abnormal answer signal is input.
Trouble shooting 13 E28. 1
Indicate or Display:
Detective Actuators:
Detective details:
OUTDOOR UNIT Error Method:
Forecast of Cause :
Check if communication line is correctly connected
<< After Indoor unit Auto Adress setting >>
OK
1. Indoor unit address setting error
2. RB unit controller PCB defective
Outdoor unit Main PCB
Check Point 1 : Check the indoor unit address setting
Check the indoor unit address.
Check Point 2 : Replace RB unit controller PCB
Replace RB unit controller PCB.
When there is except 0~63 (64 or more) in the indoor unit address of
the indoor unit connected to RB unit.
When the address memorized to RB unit was incorrectly value.
Detective Actuators:
Detective details:
Forecast of Cause :
<< After RB unit Auto Adress setting >>
04-22
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