Haier AW07LC2VHA Technical Overview page 40

Testing Temperature Sensors
The easiest problems to solve will involve codes that are
related to potential failure of temperature sensors. Common
problems may include loose connections, open electrically,
and out of calibration. Checking the condition of the sensors
requires a temperature probe and an ohmmeter.
The Reference Section of this manual contains temperature
resistance tables that can be used to check the calibration
of the sensors. The measured resistance must be within the
tolerances printed on the top of the tables.
To test the electrical condition of a temperature sensor
perform the following:
1. Confirm the sensor is firmly attached to the circuit
board connection plug.
2. Remove the sensor wires from the connection plug
by releasing holding tension on the plugs tension tab.
3. Use an ohmmeter to test the electrical resistance of
the sensor.
4. Measure the air temperature near the sensor and
compare the required resistance against
measured resistance. (See chart in reference section)
If the sensor is within calibration, the sensor is good.
If the sensor is out of calibration, replace the sensor.
(Tube Sensors should be removed from socket and
exposed to air temperature during test.)
PAGE 40
INDOOR WALL MOUNT UNIT SECTION
Testing Temperature Sensors and Louver Motors
TESTING
Testing Louver Motors
If the louver does
not operate with
command from the
remote control,
either the indoor
board is bad, or
the louver motor is
defective. It is more
likely the motor is
defective than the
board. (Make sure the louver assembly is not binding and
keeping the vanes from moving.)
1. Remove power from the unit and remove the indoor
unit cover.
2. Access the circuit board.
3. Identify on the schematic drawing the inoperable lou-
ver motor and disconnect the plug from the circuit
board. (The up down louver motor is located on the
right side of the indoor unit. The left right louver mo-
tor is located bottom center. )
4. Use an Ohmmeter to test the electrical continuity
of the louver motor windings. The proper resistance
for each winding can be found in this table. If the mo
tor winding resistance is erratic or shows open, the
motor is defective. Replace the motor.
5. If the motor checks out good, replace the indoor
control board.