Sharp DW-71-H - Page 23

23
DW-71-H
Trouble
5. The fan motor fails
to run.
6. Although the 
compressor and fan 
motor run normally, 
dehumidification is
impossible.
7. Even when the 
water tank is fully 
filled with water, 
power is not turned 
off and water flows 
over from the water 
tank
8. FULL WATER STOP 
acts even when the 
tank is not full of 
water.
9. Abnormal frosting
on evaporator
10. Defrosting does 
not end.
11. Noise (abnormal 
sound)
12. Water leak
Both end voltage of fan 
motor
Fan motor
Fan motor drive circuit
Defrosting does not end.
Room temperature and 
humidity
Filter
Refrigeration cycle
Frost on evaporator
FULL switch
Float
The water tank has been 
installed improperly.
FULL switch
FULL circuit wiring
Room temperature
Refrigeration cycle unit
Fan motor
Defrosting thermisto
Defrosting circuit
Defrosting thermistor
Defrosting circuit
Installation place
Tightening parts
Fan
Piping pipe
FULL switch
Dew pan
Float
Handling
• Voltage detected: Check the fan 
motor.
• Voltage not detected: Check the 
drive circuit.
Power is not supplied to winding.
Motor lock
Temperature fuse opened
• Connector contact failure
•Wiring material defect
•Power supply PWB ass’y failure
The fan motor stops and the 
solenoid valve is turned on during 
defrosting.
(Normally, defrosting ends within 
5 to 15 minutes.)
Room temperature is lower than 1˚C 
or humidity is lower than 50%.
Filter clogged
Coolant shortage or gas leak
Defrosting failure
Microswitch short-circuited
(Power is supplied continuously 
even when the water tank is 
removed.)
The float does not function normally.
Improper installation
Contact failure
FULL circuit wiring failure
Lower than 1˚C
Overcharge
Fan motor failure
Defrosting thermistor failure
Operation PWB ass’y failure
• Defrosting thermistor failure
• Improper insertion of defrosting 
thermistor
• Connector contact failure
Power PWB ass’y failure
Floor inclines insignificantly.
Check tightness of screws.
Contact of fan with other parts
Contact of piping pipe with other 
parts
FULL switch short-circuited
Condensate is not completely 
received by the dew pan.
Float malfunction
The water tank was removed soon 
after the FULL WATER STOP acted.
Replace.
Replace.
Replace.
Repair or replace.
Repair or replace.
Repair or replace.
Wait until defrosting ends.
Use within operating temperature 
range 1 to 40˚C.
If relative humidity is less than 50%, 
dehumidification rate reduces 
remarkably.
Replace and clean the filter.
Replace the compressor and dryer 
filter.
Check the defrosting circuit.
Replace.
Repair or replace.
Install correctly.
Replace.
Repair or replace.
Out of use range
Supply a new specified quantity of 
coolant.
Replace.
Replace.
Repair or replace.
Replace.
Repair
Repair
Repair or replace.
Install on horizontal strong floor.
Retighten.
Prevent contact.
.
Prevent contact.
Replace.
Check for deviation and deformation 
of parts, check for inclination. 
Correct.
Correct or replace.
Condensate on the cooler falls down
insignificantly. This phenomenon is
normal.
Repair or replace
Repair or replace
Checking Troubleshooting and cause Corrective action