Self Test; Control Principle Of Electronic Component - Haier HRF328W2 Service Manual

SERVICE MANUAL
Model: HRF328\368
Test method of error code F3 (R SNR defective)
1. Check whether the connector CN1 of power board PCB is installed in position.
2. Disconnect connector ,test the resistance between the white and white wires of CN1 connector,
the normal resistance should be 1-6K ohm. If the resistance is infinite or 0, it means the internal
circuit is open or short circuit.
3.If above test is abnormal, open the sensor cover, disconnect the sensor, test if sensor is failure,
replace the sensor if the sensor is defective, re-wiring, sealed and then put it back.
Test method of error code F1 (Defrost SNR defective)
1. Check whether the connector CN1 of power board PCB is installed in position；
2. Disconnect connector, test the resistance between black and black wires of CN1 connector,
normal resistance should be about 1 ~ 6K ohms, if the resistance is infinite or 0, it indicates sensor
failure.
Note: Although the defrost sensor is fault, but it will not affect the performance of refrigerator. Only
the defrosting effect is a bit poor.
Test method of error code E0 (Communications defective)
1. Demount the top hinge cover of refrigerator, check if the connector is in good condition.
2. Demount display board, check if display panel connector is in good condition
3. Check whether the connector CN2 of main control PCB is installed position
4. Test if each wires of CN2 connecting to display panel are conduction.

5-4. Self Test

Test mode T1：
When the display panel is locked, Press the key "A" 、 "B" and "C" at the same time for 3 seconds,
the refrigerator enter to TEST mode and display "T1"on display panel.
Under the T1 mode, the compressor and fan will be working forcibly until manual exiting.
Manual exiting:
Under T1 mode, press the key "A" 、 "B" and "C" at the same time for 3 seconds (the display panel is
locked), the refrigerator will exit TEST mode, the former temperature will resume on the display panel.

5-5.Control principle of electronic component

Control Principle of the Fan
5-5-1
The cooling fan is controlled by the control PCB according to the following conditions.
1. When the compressor begins to run, the refrigerator fan will run after 60s . When the compressor
stops,
the fan will stop after 60s
2. When the door is opened, the refrigerator fan will stop working and when the door closed, the fan will
run.
3. When the refrigerator is defrosting, the fan will stop working.
4. When the refrigerator is powered at first time, the compressor and fan will run at the same time.
Defrosting Control Principle
5-5-2
1. A defrosting cycle will be started when the compressor is working for 12 hours continuously.
It will stop defrosting when the defrosting sensor detects the temperature is over 6ºC or the
Issue 2015-7-18
Rev.
Ref 1507S002V1
16