Service manual

3 – 8
2. When one room is not cooled (other rooms are cooled)
Yes
Yes
No
Yes
No
No
No
Yes
No
No
Yes
Yes
Short circuit of the thermi
stor error
Open circuit of the thermistor error
Open circuit of serial s
ignal line
Short circuit of serial s
ignal line
Is the timer lamp of the indoor unit in the room not cooled flashing ?
Press the OPERATION button to start operating the air-conditioner. (Set the cooling mode
to 18ûC.) Is the timer lamp of the indoor unit in the room not cooled flashing ?
Check that the power between the terminal board "N" and "1" of the indoor unit is AC 230V.
Repair the wiring
between the units.
Replace the indoor
control PWB.
Replace the thermistor.
Check the failure
symptom with the failure diagnosis mode.
Replace the outdoor control
PWB
or the expansion valve (UNIT A) or the expansion valve (UNIT B) or the expansion valve (UNIT C) or the expansion valve (UNIT D)
Is the resistance value of the winding in the fan motor ? (Between 1 and 3 of CN1)
Abnormal fan motor of
indoor unit The thermal fuse is blown. The motor is locked.
Replace the indoor fan moto
r.
Is the wiring between the units connected by mistake or broken ?
Repair the wiring between the units.
Replace the indoor control PWB.
Is the resistance value of the ther
-
mistor for UNIT A (TH6), UNIT B (TH7), UNIT C (TH8) or UNIT D (TH9)