Trouble Shooting - Haier AFD631 Service Manual

TROUBLE SHOOTING

Trouble Shooting
Symptom: food in the fridge storage compartment is frozen
Check:
1) Verify that the temperature in the fridge storage compartment is too low and the food is
frozen there;
2) Remove the decoration piece of the refrigeration air-duct. Detach the 2 screws and take
out the air door-foam assembly. Press the "Refrigeration OFF" button to see if the air door
closes automatically. If the air door closes tightly, continue to next step. If the air door does
not close normally, continue to step 6).
3) Disconnect the connection wires of the air door and the LED lamps. Take out the air
door-foam assembly. Tear the adhesive tape wrapped around the foam and separate the
foam. Check if the seal between the air door and the foam is tight.
4) If the seal is tight, check if the fridge storage temperature sensor R1 is OK.
5)If the sensor R1 is OK, then the main control panel is probably malfunctioning.
6) If the wiring of the air door is OK, check the circuit from the connector of the main control
panel to the connector in the cabinet. If there is no problem in this circuit, the air door is
malfunctioning.
Solutions: 1) If the seal between the air door and the foam is found to be not tight, please affix seal
strip on the interface between the air door and the foam;
2) If the sensor R1 is malfunctioning, please replace it with a new one;
3) If the main control panel is malfunctioning, please replace it with a new one;
4) If the connector of the air door is connected with reverse polarity, please reconnect it
correctly;
5) If the air door is malfunctioning, please replace it with a new one.
Symptom: the buzzer beeps to alarm
1) Test across pin 1 and pin 3 of CN1 on the main control panel. The 2 pins should be switched to
conduction when the door is closed and disconnected when the door is open.
2) If pin 1 and pin 3 of CN1 are disconnected in both cases, please remove the front decoration strip to
see if the door switch is still in the slot.
Symptom: no defrosting
Check: 1) Activate the forced defrosting function by double pressing the button on the main control
panel. Then, check if the temperature of the defrosting heating wire is rising.
If the temperature of the heating wire does not change, remove the fan cover plate to
check if all the connectors are connected properly and test if there is 220V voltage
output across the terminals of the heating wire.
2) Measure the resistance of the heating wire with a multimeter. It should be around 345Ω.
3) Measure the resistance of the defrosting fuse. If it is zero, the fuse is OK. If it is infinite,
the fuse is malfunctioning.
4) If no malfunction is found in the above checks, please test the defrosting temperature
sensor with a multimeter.
Symptom: neither displaying nor starting when powering on
Check: 1) Check if the power supply is connected properly.
2) Remove the main control panel and examine its back side carefully to see if there are
solder skips or open soldering;
3) Check if the connector of the freezer door hinge is connected properly.
4) Verify the display panel to see if the refrigerator is in OFF state. If so, press and hold the
button on the power board for 3s to turn it on.
Solutions：
1) If there is dry soldering or open soldering on the control panel, resolder it with an electrical
iron.
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