Haier AW09EH2VHD Service Manual page 54

Ductless Troubleshooting
Checking System Components
NOTE: Component resistance readings shown in this section
are for reference only. Actual resistance values may
based on model being tested.
Component readings shown below are based on the models
of 1U*EH2VHD outdoor unit.
Checking Outdoor Unit Components
Testing of the following components requires the use of
needle probes. Avoid testing the connector end of the plug,
as damage to the internal sections of the plug can occur.
Checking the Outdoor Unit Sensors
NOTE: Use respective temperature / sensor chart for sensor
type being tested.
Compressor discharge sensor
Suction sensor
Defrost temperature sensor
Ambient sensor
Step 1
Disconnect the sensor plug from the control board for this
test. Failure to do so may provide inaccurate readings.
Step 2
Using k-type temperature probe, determine the temperature
of the sensor being tested.
Step 3
Using an ohmmeter, check the resistance value of the sensor.
Step 4
Referring to the temperature / resistance table for the sensor
being checked, verify the resistance value corresponds to the
temperature checked in Step 2.
Replace the sensor if the reading is open, shorted, or outside
Step 5
Re-seat the plug on the connector at the conclusion of the
test.
Checking the Reversing Valve Coil
Step 1
Disconnect the reversing valve plug from the PCB
for this test. Failure to do so may provide inaccurate read-
ings.
Step 2
Using an ohmmeter, check the resistance value of the coil.
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ERROR CODES and Troubleshooting
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The resistance value of the coil should be 1.2 kilo ohms to
1.8 kilo ohms. Replace the valve c
Step 3
Re-seat the plug on the connector at the conclusion of the
test.
Checking the DC Fan Motor
Step 1
Using needle probes, check the DCV at the back of the fan plug on
the PCB. The values are:
Red to black: +310 VDC
White to black: +15 VDC
Yellow to black: 1-4 VDC when running; 0 VDC when there is no call
for heating or cooling
Blue to black: pulsing 0-8 VDC when running; 14 VDC when there is
no call for heating or cooling
Checking the EEV Coil
Step 1
Disconnect the EEV coil from the PCB for this test. Failure
to do so may provide inaccurate readings.
Step 2
The resistance values of plus pin combinations are 46 Ohm.
Step 3
Re-seat the plug on the connector at the conclusion of the
test.
Checking the Compressor Windings
Step 1
Disconnect wiring from terminals U, V and W of the IPM.
Step 1
Using an Ohmmeter, check the resistance value of the
compressor windings. Measure between wires U and V,
U and W, and V, and W.
The resistance value of the windings should be balanced
(equal). If the resistance values are not equal, verify the
wiring and connections to the compressor as well as the
compressor itself. Repair or replace as needed.
Rev. 04-20