Troubleshooting Guide - Sharp AF-T908X Service Manual

AF-T908X
AF-R908X
AF-R1108X
AF-R1208X

TROUBLESHOOTING GUIDE

Symptom
Neither fan motor
nor compressor
operate
In sufficient cooling
No cooling
TROUBLESHOOTING GUIDE
Check
1) Fuse open or circuit breaker
1) Check power supply
switch or plug and
measure the voltage
2) Plug disconnected
3) Plug connected properly but
4) PWB ass'y fuse open.
1) The set temperature high
1) Set temperature
2) Check thermistor
Air filter clogged
2) Check air filter
3) Check for a high heat source
4) Check doors and windows
5) Undersized unit
6) Check if condenser and evaporator are clean
7) Check if any object is restricting heat radiation from
the condenser
8) Sealed system
1) No temperature 1) Gas leak
difference
2) Compressor defective
between discharge
pipe and suction
pipe of compressor
1) Equipment defective if no temp.
2) Check if temp.
difference between
inlet and outlet air
2) Outside air too high temp.
of indoor unit is over
14˚F
3) Air conditioner normal but heat
1) Capillary tube restricted
3) Check indoor
exchanger inlet/
2) Gas leak
outlet piping temp.
Sweat is less than
half of coil or frost
sticks to capillary
tube
Defect
open
contact defective
(Refer to page 27)
difference
load excessive
24
Remedy
1) If fuse or breaker are
normal, ask the power
supply company for
check.
2) Connect properly.
3) Change power supply
cord with plug.
4) Change fuse.
1) Down set temperature
1) Change thermistor
Clean
Remove the added heat
source
Windows and doors must
be kept closed
Calculate heat load
Clean them with steam
cleaner or another method
Remove the object or move
the air conditioner
Check sealed system
1) Repair gas leak
2) Change compressor
1) Change or repair defect
2) Improve ventilation,
avoid sunshine
3) Calculate cooling load
and change or remove
heat source
1) Change capillary tube
2) Check for gas leak and
repair, recharge