23
Cool
YES
Outdoor unit
runs
NO
YES
RCU
YES
Outdoor unit
runs
NO
YES
RCU
A/C
Heat (AU 310 HL/HLQ only)
Try to lower setting tempera-
ture by temperature setting
button "COOLER".
Try to raise setting tempera-
ture by temperature setting
button "WARMER".
Set operation selector switch
in TEST position on indoor
unit.
Set operation selector switch
in TEST position on indoor
unit.
(6) Check setting temperature.
Temperature is too low.
Temperature is too high.
Try to run with another remo-
te control unit.
Try to run with another remo-
te control unit.
Check selector "B" on back
of remote control to see
which is selected, A/C or
RCU.
Check selector "B" on back
of remote control to see
which is selected, A/C or
RCU.
First remote control unit is
defective. (Room sensor in
remote control unit is defec-
tive. That is, sensor is
SHORT).
First remote control unit is
defective. (Room sensor in
remote control unit is defecti-
ve. That is, sensor is OPEN).
Room sensor (TH2) in
indoor unit is defecti-
ve. (Sensor is OPEN).
Room sensor (TH2) in
indoor unit is defective.
(Sensor is SHORT).
A/C
If fuse blows, there is a
possibility of short circuit.
OK
OK
Check fuse on PCB Ass’y in indoor unit
for continuity.
Measure resistance of indoor fan motor
winding (FMI).
PCB Ass’y in indoor unit is defective.
Measure resistance of primary winding
of transformer.
(5) Check fuse on PCB Ass’y in indoor unit.
IMPORTANT
During normal operation, the operation selector switch must be set in the ON position.
