Toshiba RAS-07EKH Service Manual page 36

Block level
Check
Block
code
Indoor PC
board
Cable
connection/
Thermal fuse
Refrigerant
system
Check
Symptom
code
Thermo sensor
short/break.
Heat exchanger
sensor short/
break.
Indoor fan lock,
abnormality of
indoor fan.
Abnormality of
other indoor unit
PC board.
• Thermal fuse
cut off.
• Indoor fan lock,
abnormality of
indoor fan.
• Gas shortage.
(gas leak)
• Other refriger-
ant cycle
trouble.
• Heat exchanger
sensor off/
break/short.
• Overload relay
break
Table 9-5
Diagnosis function
Air conditioner
status
Continued
operation
Continued
operation
All off.
Continued
operation
All off.
All off.
– 36 –
Judgement and action
Condition
Indicated when • Check thermo sensor.
detected abnor-
• If it is OK, check PC
mal.
board. (Around sensor
circuit)
• Check heat exchanger
Indicated when
sensor.
detected abnor-
mal.
• If it is OK, check PC
board. (Around sensor
circuit)
• Check motor.
Indicated when
detected abnor-
• Replace PC board, if
mal.
the same failure
occurs, after the motor
check.
Indicated when Replace PC board.
detected abnor-
mal.
Indicated when • Check thermal fuse.
detected abnor-
• If it is OK, check
mal.
motor.
• If motor is OK, check
PC board. (12V power
circuit)
• Check gas quantity.
Indicated when
detected abnor- (Check gas leakage)
mal.
• If it is OK, check heat
exchanger sensor.
• If heat exchanger
sensor is OK, check
overload relay.
• If overload relay is OK,
check refrigerant
cycle.
• If refrigerant cycle is
OK, check PC board.