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Troubleshooting
Step 3
Reconnect the wiring to the IPM at the conclusion of the
test.
NOTE: Resistance readings shown in this section are for
reference only
type being tested.
Coil sensor
Ambient sensor
Step 1
Disconnect the sensor from the PCB for this test. Failure to
do so may provide
inaccurate readings.
Step 2
Determine the temperature of the sensor being tested.
Step 3
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 PCB at the conclusion of the test.
Checking the Up/Down Stepper Motor
Step 1
Disconnect the Up/Down Stepper Motor plug PCB for the test.
Failure to do so may provide inaccurate readings.
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.
Checking the Indoor Unit Sensors
NOTE: Use respective temperature / sensor chart for sensor
Testing of the following components requires the use of an
ohmmeter and k-type temperature probe.
Checking Indoor Unit Components
Checking the Base Pan Heater
The resistance across the heater should be 100 to 500 ohms.
ter
reads open or shorted.
Winding resistance
09K
12K
18K
Model
ERROR CODES and Troubleshooting
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.
Red Orange Yellow Pink
Blue
Red 296.5Ohm 295.5 Ohm 296.3 Ohm
296.1 Ohm
Orange 594.5 Ohm 595.5 Ohm
594.5 Ohm
Yellow 594.3 Ohm
594.5 Ohm
Pink 594.3 Ohm
Blue
Step 1
Disconnect the Motor plug from the PCB for this test. Failure
to do so may provide inaccurate readings.
Left/Right Stepper Motor eht gnikcehC
PAGE 102
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