Haier HB21FWRSS Service Manual - page 27
CN12 is the power supply for the power filter board. Parts from up to right are,
1-2 Connect to ground line.
3-4 supply DC 12V voltage.
5-6 supply DC 16V voltage.
CN13 Connects to the live line of power cable.
CN14 Connects to the null line of power cable.
3. Air Escaper Controlling Pinciple
(1)Air escaper’s open and close is controlled by fridge sensor R SNR.
(2)Air escaper is closed from the start of defrosting cycle to 15 minutes before the end of
defrosting cycle.
(3)Air escaper is closed firstly and then opened once, then open or close of air escaper is
controlled according condition (1).
(4)If air escaper is closed more than an hour, it will be opened at a time. Then open or close of air
escaper is controlled according fridge sensor R SNR.
(5)The heater of air escaper is controlled along with compressor.( The heater of air escaper is
connected when the compressor is running, and disconnected when compressor is shut. )
(6)When the air escaper is open (or close ) in 10 minutes, if the temperature is still rising (or fall),
the air escaper will open (or close) once more.
4. Ice Maker Control Principle
4.1Operation Process of the Icemaker
Be Powered
Initial Control
Ice-making control
Ice Pushing Control
Water Inlet Control
Test
When it is powered, the ice tray is set horizontally.
When the ice-making operates, the water in the tray
is cooled down.
The motor rotates to different directions to confirm
if there is ice in icebank (ice testing). If the ice is not
full, it performs the ice pushing. Ice pushing will stop
and ice tray will reset adjustment horizontally, if
freezer door is opened when ice pushing. Ice testing will
start again and start a new ice making cycle after freezer
door is closed.
After ice pushing, it performs water inlet control.
Then it returns to ice-making control
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