Checking System Components; Checking Outdoor Unit Components; Checking The Outdoor Unit Sensors; Checking The Reversing Valve Coil - Haier HSU09VHG(DB)-W Service Manual

Checking System Components
NOTE: Component resistance readings shown in this section
are for reference only. Actual resistance values may differ
based on model being tested.
Component readings shown below are based on a model
HSU12VHGL-W outdoor unit.
Checking Outdoor Unit Components
Testing of the following components requires the use of an
Ohmmeter and Temperature Probe. (Temperature probe is
used during sensor testing only).
NOTE: When using the test probes, probe the back or side
contacts of the plug to obtain the reading. Do not try to
probe the connector end of the plug as this may damage the
contacts of the plug.
Checking the Outdoor Unit Sensors
NOTE: Use respective temperature / sensor chart for sensor
type being tested.
Compressor discharge sensor
Suction sensor
Tube sensor (defrost temperature)
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 a 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
the specifications of the temperature / resistance table.
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 control
board connector for this test. Failure to do so may provide
inaccurate readings.
Step 2
Using an Ohmmeter, check the resistance value of the coil.
The resistance value of the coil is 2.08K Ohms. Replace
the valve coil if the reading is open, shorted, or a value
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significantly different from 2.08K Ohms.
Step 3
Re-seat the plug on the connector at the conclusion of the
test.
Step 1
Disconnect the DC Fan Motor plug from the control board
connector for this test. Failure to do so may provide
inaccurate readings.
Step 2
Refer to the chart shown below for plug pin combinations and
resistance values.
Note: Test is polarity sensitive, adhere to probe placement as
shown in chart.
Black
Test
Lead
Step 3
Re-seat the plug on the connector at the conclusion of the
test.
Step 1
Disconnect the EEV Stepper Motor plug from the control
board connector for this test. Failure to do so may provide
inaccurate readings.
Step 2
Refer to the chart shown below for plug pin combinations and
resistance values.
Step 3
Re-seat the plug on the connector at the conclusion of the
test.
Step 1
Disconnect wires from terminals LI and LO of the power
module board.
Step 2
Using an Ohmmeter, check the resistance value of the PFC
Reactor. The resistance value of the coil is less than 1 Ohm.
If the resistance value differs from this value, verify the
ERROR CODES & PROBLEM SOLVING
Checking the DC Fan Motor
Red Test Lead
Red --- Black
Red --- 3.10 Meg
--- ---
Black
White
Yellow
Blue
Checking the EEV Stepper Motor
White Yellow Orange
White --- 92.6Ohm
Yellow ---
Orange
Blue
Red
Grey
Checking the PFC Reactor
White Yellow Blue
3.05 Meg 3.28 Meg Charges to infinity
--- --- ---
43.85K 145.1K Charges to infinity
189.0K Charges to infinity
Charges to infinity
Blue Red Grey
--- 47.0 Ohm ---
93.1 Ohm --- 47.0 Ohm
46.5 Ohm ---
46.8 Ohm
---