Sharp AE-X4M30PU Service Manual page 23

2) When one room is not cooled (other rooms are cooled)
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
Is the timer lamp of the
indoor unit in the room
not cooled flashing ?
Check that the power
No between the terminal
board "L1" and "L2" of the
indoor unit is AC 230V.
Replace the indoor
control PWB.
Repair the wiring
between the units.
Yes
No
61ºF(16ºC))
Check the failure symptom
Yes
with the failure diagnosis
mode.
No
Short circuit of the thermistor error
Open circuit of the thermistor error
Is the resistance value of the ther-
mistor for
UNIT A (TH6), UNIT B
Yes
(TH7), UNIT C (TH8) or UNIT D
(TH9)
Replace the thermistor.
Abnormal fan motor of
indoor unit
Is the resistance value of the
winding in the fan motor ?
(Between 1 and 3 of CN1)
The thermal fuse is blown.
The motor is locked.
Replace the indoor fan motor.
Yes
No
Replace the outdoor control
or the expansion valve
(UNIT A)
or the expansion valve
(UNIT B)
or the expansion valve
(UNIT C)
or the expansion valve
(UNIT D)
Open circuit of serial signal line
Short circuit of serial signal line
No
Is the wiring between the
units connected by
Yes
mistake or broken ?
Replace the indoor control PWB.
23
AE-X4M30PU
PWB
No
Yes
Repair the wiring
between the units.