Troubleshooting Guide - Haier HR18D2VAR Service Manual

7. Other Check Points
A. Verify the operating voltage is within the specified range.
B. Check that all wiring connections are tight.
C. Verify that all fuses or circuit breakers are of the proper type and operational.
D. Verify the air conditioning operates properly in cooling.
E. Inspect all the other electrical components for proper operation.
F. Verify the thermostat and subbase are correct and operate properly.
G. Verify all ducts and air moving device are sized and operate properly.
H. Verify the refrigerant piping is sized correctly and not pinched.
I. Verify all the system are in correct position.

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
Power
connection
No cooling/heating
Incorrect thermostat setting
Defective 4-way valve
Compressor without pump function
Dirty filters
Indoor air blockage
Blocked outdoor coil
Improperly sized unit
Insufficient Cooling
Improper airflow
Incorrect refrigerant charge
Air, non-condensable or moisture in
system
Incorrect voltage
Water on floor or in Blocked condensate drain and "P"
furnace trap
Condenser fan and AC Contact not connected to the
compressor don't run power supply wire or not tightly fasten t ightly fasten.
The outdoor power supply main circuit
switch in "OFF" position or fuse
blown on main circuit
The coil of outdoor unit Contactor does
32
Central Air Conditioning
Possible Cause
off or loose
not have 24V AC power
electrical Make sure main switch is ON. Check and
tighten all connections.
Set thermostat correctly
check the valve coil or replace it
replace it
Clean & replace
Check supply registers and return grills for
blockage.
Clear away leaves and other debris
Recalculate load
Check – should be 400CFM/Ton
Charge correctly per instruction.
Recover refrigerant, evacuate & recharge,
add filter drier
At compressor terminals, voltage must be
within 10% of rating plate volts when unit is
running.
Remove blockage and clean drain lines, verify
operation of condensate pump.
Re-connect the power supply wire, and
Reset the power supply switch to " ON "
position or change the fuse and confirm the
main power lead to the
has voltage present.
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 ，
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.
Model: Heat Pump, HR13-D2
Remedy
Contactor