Error Codes & Troubleshooting - Haier GE 2U18MS2HDA Service Manual

Error Codes & Troubleshooting
Outdoor Fan Motor
Check that the wiring and plug connections are in good condition.
Check the following voltages at connector CN11 on the outdoor unit PCB if the outdoor
unit fan motor does not run, or the Service Monitor Board indicates an error code of 09. Set
the meter to read DC volts with a minimum voltage range of 350 volts. All voltage values are
approximate. Initiate forced cooling.
DC voltage between the Red and Black wires on the CN11 plug should read 310 ~ 334
1
VDC. This is the main voltage for powering the fan motor.
DC voltage between the White and Black wires on the CN11 plug should read 15VDC.
2
This is the voltage for powering the electronic circuit of the fan motor.
DC voltage between the Yellow and Black wires on the CN11 plug should read 4VDC.
3
The voltage will read 0VDC when the fan is not being called to operate. This is the control
voltage for regulating the speed of the fan motor.
DC voltage between the Blue and Black wires on the CN11 plug should read 8VDC. The
4
voltage will read 14VDC when the fan is not being called to operate.
(This is the feedback voltage to the PCB for determining the speed of the fan motor)
The feedback circuit is not functioning if the outdoor fan initially runs, increases speed then
stops, and the Service Monitor Board indicates an error code of 09. Check that the wiring and
plug connections are in good condition.
Temperature Sensor
The temperature sensors are negative coefficient thermistors in which resistance
decreases as temperature rises. The PCB will generate an appropriate error code
should the sensors fail.
To check the calibration of the sensors:
Shut off power to the outdoor unit.
1
2 Disconnect the sensor at the circuit board plug.
Measure the temperature of the air surrounding the sensor.
3
Measure the electrical resistance of the sensor using needle probes. Do not
4
force standard probes into the sensor plug.
Compare the measured resistance of the sensor against the resistance/
5
temperature specifications (refer to Reference Information section for
sensor tables).
Replace the sensor if the sensor resistance is outside of the specification
6
tolerances shown on the resistance/temperature table.
Component Testing
Red
Black
White
DC Motor
Yellow
Blue
ERROR CODES & TROUBLESHOOTING
1
2
3
4
+310 VDC
DC Ground
PCB design may vary by model number
+15 VDC
Signal
Feedback
2
4
PCB design may vary by model number
Outdoor Fan 310VDC
Pins 1 - 3
Outdoor Fan 15VDC
Pins 3 - 4
Outdoor Fan Control
Pins 3 - 5
Outdoor Fan Feedback
Pins 3 - 6
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