7. Other Check Points
A. Verify the operating voltage is within the specified range.
E. Inspect all the other electrical components for proper operation.
F.
I.
10.
2
Troubleshooting Guide
! 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
check the valve coil or replace it
No cooling/heating
replace it
Dirty filters
Clean & replace
Indoor air blockage
Check supply registers and return grills for
blockage.
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
Insufficient Cooling
Incorrect voltage
At compressor terminals, voltage must be
within 10% of rating plate volts when unit is
Water on floor or in
furnace
trap
Condenser fan and
The outdoor power supply main circuit
B. Check that all wiring connections are tight.
C. Verify that all fuses or circuit breakers are of the proper type and operational.
G. Verify all ducts and air moving device are sized and operate properly.
Verify all the system are in correct position.
D. Verify the air conditioning operates properly in cooling.
Verify the thermostat and subbase are correct and operate properly.
H. Verify the refrigerant piping is sized correctly and not pinched.
Defective 4-way valve
Blocked outdoor coil
Compressor without pump function
AC Contact not connected to the
Blocked condensate drain and “P” Remove blockage and clean drain lines, verify
operation of condensate pump.
switch in “OFF” position or fuse
blown on main circuit
Reset the power supply switch to " ON"
position or change the fuse and confirm the
Contactor
running.
main power lead to the
Re-connect the power supply wire, and
has voltage present.
compressor don’t run power supply wire or not tightly fasten t ightly fasten.
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.
The coil of outdoor unit Contactor does
not have 24V AC power
Check if the relay P2 of system PCB has a
current output, if not, check if P1 and P3
have 24 V AC input . If have 24V AC
，
32
Central Air Conditi
oning
Model: Heat Pump,
HR13-D2
