Haier CFE633CWE - Self Test Model; 5 Control Principle of Electronic Component; Air Escaper; Control Principle of the Fan Motor

SERVICE MANUAL
Model: CFE629CW
17
Issue 2009-12-23
Rev. Ref0912S021V0
4-3. Self test model
TEST1：Press the TEST key on the power board to enter the (PULL DOWN MODE), the door display
panel displays T1 T1 and the refrigerator enters forced refrigeration state: the compressor
operates normally, the fan runs at high speed, and the defrosting heating wire is disconnected.
This can be used to test the refrigeration performance.
TEST2：Press TEST key again in TEST1 MODE to enter the (FORCED DEFROSTING MODE). It will
act depending on the temperature sensed by the defrosting sensor When the temperature
sensed by the defrosting sensor is over 10 , the heating wire will exit the (FORCED ℃
DEFROSTING MODE)after 20s’ heating When the temperature sensed by the defrosting
sensor is below 10 , the heating wire will heat continuously until the temp℃ erature sensed by
the sensor reaches 7 In the (FORCED DEFROSTING MODE), the door display panel ℃
displays T2 T2, the refrigerator conducts forced defrosting, the compressor and the fan are
turned off, and the defrosting heating wire is turned on. At this moment, you can test the power
of the defrosting heating wire and it should be 153±15W.
Chapter 5 Control principle of electronic component
5-1. Air Escaper
(1) The refrigeration air door is controlled with the fridge storage temperature sensor R SNR.
(2) The air door is closed from the beginning of defrosting until 15 minutes after the defrosting is
finished.
(3) Upon initial powering on or resetting of the control panel, the air door conducts a
close-and-open cycle before acting according to the control conditions in item (1).
(4) The air door will be forced to conduct an open-and-close cycle if it has been closed for 1
hour. After that, its closing/opening will be controlled by R SNR.
(5) If the temperature is still rising (or dropping) within 10 minutes after opening (or closing) of
the air door, it will open (or close) once again.
5-2. Control Principle of the Fan
The freezer fan is controlled by the control panel according to the following conditions. The DC
fan’s rotation speed is regulated with PWM mode and the AC fan operates directly.
(1) ON/OFF condition of the freezer fan (The control mode of the DC fan is listed in the table below.
The AC fan runs under condition ON and stops running under condition OFF):
(2) When the fridge storage compartment door is opened, the freezer fan will run and the refrigeration
air door will open. After 2 minutes, the refrigeration air door will close;
(3) When the freezer storage compartment door is open, the freezer fan will not run;
(4) Conditions for judging LOCK of the freezer fan: If the rotation speed of the fan is less than
300RPM or the fan does not run and the state has persisted for over 30 seconds, a freezer fan
malfunction will be displayed. Normal display will be recovered after it becomes normal.