Comfortstar Service manual for 13seer Cooling Only Condensing
14
15
Enough time for Vacuumizing
? yes ? no
other
16
Whether the pressure coming back after 1 hour
holding
? yes ? no
other
17
Whether need more refrigeration
? yes ? no
other
18
Whether the outdoor vavles opened
? yes ? no
other
19
Proper power supply
? yes ? no
other
20
Terminal connected substantially
? yes ? no
other
21
Make sure the switch for leaking current installed
? yes ? no
other
22
Proper length of the power cable
? yes ? no
other
23
Reliable grounding
? yes ? no
other
7.6
Troubleshooting
! WARNING
–
Disconnect all electrical power to the unit before servicing. Disconnect power to both the
indoor and outdoor units. NOTE: There may be more than one electrical disconnect switch. Failure to shut
off power can cause electrical shock resulting in personal injury or death.
Symptom
Possible Cause
Remedy
Power off or loose electrical
connection
Make sure main switch is ON. Check and
tighten all connections.
Incorrect thermostat setting
Set thermostat correctly
defective 4-way valve
check the valve coil or replace it
No cooling/heating
compressor without pump function
replace it
Dirty filters
Clean & replace
Indoor air blockage
Check supply registers and return grills for
blockage.
Blocked outdoor coil
Clear away leaves and other debris
Improperly sized unit
Recalculate load
Improper airflow
Check – should be 400CFM/Ton
Incorrect refrigerant charge
Charge correctly per instruction.
Air, non-condensable or moisture in system Recover refrigerant, evacuate & recharge, add filter
drier
Incorrect voltage
At compressor terminals, voltage must be
within 10% of rating plate volts when unit is
Insufficient Cooling
running.
Water on floor or in
furnace
Blocked condensate drain and “P” trap
Remove blockage
AC Contact not connect to the power
supply wire or not tightly fasten.
Re-connect the power supply wire ,and tightly
fasten.
Dial the power supply switch to “ON ”
The outdoor power supply main circuit
switch locate “OFF” position or fuse failure
of main circuit
position or change the fuse and make sure the
main touch point of AC Contactor have current go
through
Condenser fan and
compressor don’t run
The control coil of AC Contactor no 24 V
AC power
Check if the relay P2 of 3-minute timer board have
current output ,if not ,check if P1
、
P3 have 24 V
AC input
，
if have 24V AC
，
please check if it
keep for 3 minutes
，
if so and P2 no output
，
change the 3-minute timer board
；
if keep time < 3
minutes
，
P2 no output ; if P1
、
P3 no24V AC
，
first
check the thermostat C
、
Y terminal have 24 V AC
，
if no 24 V AC
，
then check the thermostat or reset
the setting temp.; if have 24 V AC ,check if the C Y
and P1
、
P3 connection wire cut off or fasten
loosely
，
if cut off
，
then change the parts.
Run or start capacitor defective
Replace
Loose connection
Check and tighten all connections.
Compressor stuck, grounded or open motor
winding, open internal overload
Wait for 2 hours for overload to reset. Replace
compressor if still open.
Condenser fan runs,
compressor doesn’t
Low voltage condition
At compressor terminals, voltage must be
