1. When normal refrigeration operation works on the first POWER ON, but troubles with freezing and
refrigerating occur after some time (at defrosting step), there must be something wrong with Defrosting
system and then, check the defrosting system on the basis of this trouble diagnosis.
10-3) When Defrosting does not work,
C
RITERIA FOR
J
UDGEMENT
Information
1. When there are SHORT-type troubles with EVA-SENSOR of F and R, do not charge the defrost-heater and
return to the normal operation after pause. So, if the period of non-operation of the defrost-heater is
accumulated, troubles with freezing and refrigerating may occur.
2. When there is OFF of Thermal-Fuse, a kind of safety gadget, snapping of wire, or troubles with
RELAY on PCB, troubles with freezing and refrigerating may occur because defrosting is caused by the
increase of natural temperature and thus, COMP OFF time becomes longer.
3. When there are OPEN-type troubles with Defrost-Sensor of each F and R, HEATING does not come to
be terminated and Thermal-Fuse, a kind of safety gadget, becomes snapped after some time.
So, since HEATING operation continues to operate and COMP ON does not operate, troubles with freezing
and refrigerating may occur.
On the basis
of self-diagnosis,F, R defrost-
sensor is normal?
START
Replacement of the relevant
SENSOR
Refer to reference no. 3, check of
trouble with load, of this manual
Judge on the basis of reference no. 4
and 8 of this manual
Refer to
7-6) Test function of Main function
Defrost-heater of F and
R-room are normal?
Check of Temperature FUSE,
snappingof heater itself, and
contact state of wire
Temperature of the relevant
defrost-sensor is below
-5 ?
Perform forced-operation for
some time.
Perform concurrent
forced-defroster of F, R-room
Power is supplied to
each defrost-heater?
A
B
N
N
Y
Y
N
Y
N
Y
39
