Mitsubishi TDJ300D - Page 56

2) In case defrost operation will not recover.
3) In case defrost operation is frequently made.
– 56 –
Defrost operation will not
recover.
Check defrost
thermostat
Abnormal
(It will not become
“OFF” over 8°C)
Replace defrost thermostat.
2 terminal RY line of
controller is short-circuited
and grounded.
Normal
Defrost operation is frequently
made.
Check timeon
defrost timer.
Abnormal
Change time of defrost timer.
Refer to page 7.
Controller is defective.
Normal
Remarks: If air pressure switch
(optional) is installed, check the air
pressure switch.