Samsung AM038KXWDCH, Service Manual, Page: 91 / 295

Samsung Electronics 88
Troubleshooting
4-3-6 Internal Communication error of the Outdoor Unit C-Box
1. Cause of problem
Replace Main PBA
Restart operation after connecting the Inverter
PBA2 CN31(when the Comp. applied one :
Inverter PBA1) connector. (Check the 3, 4 Pin short)
* Service after turn off the Main Power.
No
Yes
Is the jumper
connector connected to CN31 of Inverter PBA2
(when the Comp. applied one :
Inverter PBA1)?
Restart operation after checking the Inverter
PBA2 CN31 and PBA2 CN32 Communication
wire/Connector.(3, 4 Pin Short)
* Service after turn off the Main Power.
No
Yes
Yes
Is Inverter PBA1 CN32 and Inverter PBA2
CN31 connector accurately connected?
1) Check the Inverter PBA1 CN32, CN91 and
Fan PBA CN12 Communication wire/
Connector.
2) Restart operation after connecting the Hub
PBA CN97 and Fan PBA CN13 connector.
* Service after turn off the Main Power.
1) Check the Main PBA : Main PBA TX circuit
inspection
2) Check the Hub PBA : Hub PBA TX circuit
inspection
* Service after turn off the Main Power.
No
No
Yes
Is Inverter
PBA1 CN32 and Fan PBA CN12 connector
accurately connected?
Does FAN PBA LD22/LD32 (LED) blink?
Two Comp. applied to the model
Outdoor unit
display
- All boards of outdoor unit are not communicating
Indoorunit
display
Duct, Cassette (1/2 Way),Console, Celing Cassette (4/Mini4 Way) Wall-mounted (NeoForte)
Operation Defrost Timer Fan Filter/MPI Operation Defrost Timer Filter Operation Timer Turbo
ϧ ϧ ስ ስ ϧ ϧ ስ ስ ϧ ϧ ስ ስ
※ ●
: ON
◑
: Flash ×: OFF
Judgment
Method
∙ Main PBA detecting uART communication other PBA. (Hub, Inverter, Fan)
Cause of
problem
∙ Communication wire inside the C-Box is unconnected
∙ Main PBA defective
4-3 Appropriate Measures for Different Symptom (cont.)