Question about Bosch Refrigerators
SOURCE: Freezer won't defrost
I think I know what is wrong. First the defrost thermostat you are talking about I believe is the round metal type with possibly a pink and an orange wire coming out of it. That is not the defrost thermostat as most people know it. That is a defrost overheat termination thermostat that opens only over 140 degrees F, that is why your old good one and your new good one show closed at room temp. If you read on the outside of the metal cover you will find it has a L140 indicating the limit of 140 deg.
Now to what should be causing your problem. You should find on the evaporator coil at the top left side of the evaporator coil a part that has 2 white wires going into what looks like about a 1" long X 1/4" round plastic thing. That little white plastic thing is a THERMISTOR. If it is bad your defrost will not work. Sounds like that is the only thing you have not replaced. There is no polarization of the wires That should FixYa
Posted on Nov 24, 2007
loaded question any COULD be bad a volt ohm meter will tell you whitch one is bad
if this is a ge sxs i would check the defrost heater first
Posted on Jun 24, 2008
Try increasing the temperature of the freezer (closer to -5) for a few days. It could be you have it too cold.
At certain times it should feel warm in some places on the sides, or you may hear a fan running. If you don't get this, there may be a fault in the defrost circuit, timer or fan.
Make sure vents are clear, and that door seals are in good condition. A faulty door seal admits warm damp air which then freezes.
Where is the ice forming?
Posted on Jun 28, 2008
This is most likely a blocked drain pipe - blocked with ice that is.
Remove all the drawers in the freezer - and stack them up.
With the unit switched off and unplugged, undo the fixings on the rear pannel in the freezer (behind the drawers)
Remove it to see the evaporator coils etc.
At the base there should be a channel - and a hole leading to the drain pipe. This needs unblocking wih a thin flexible cable. -net curtain support wire is ideal, and cheap. or use a short length of insulated cable.
Check it comes out at the rear of the unit onto the evaporator container - situated on top ofthe compressor.
Replace everything and switch on.
Posted on Sep 08, 2009
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So first thing you try is , perform, manual defrost reset procedure.---------
The manual defrost reset procedure is as follows : ----
First unplug the unit from main power outlet. Then empty whole unit completely. Then keep both the doors open. Wait for 24 hours. All the ice collected on the coils and in the freezer section will get melted. Clean the water from the sections. Then Connect the power cord of the unit to main power outlet after 24 hours/.Then set the temperature to normal in both fridge and freezer section. Then check,if same frost is getting collected, then its defrost problem,. If it's again building up ice that means the unit is not defrosting. It's starting the cooling procedure, and then while defrosting, it's not working. The defrost assembly consists of three main parts. The defrost thermostat, the defrost heater and defrost board. Any of the one is not functioning. When thermostat sense the maximum cooling, it triggers the defrost heater to start heating and this defrosts the ice collected on the coils and the system works. Both thermostat and heater are controlled by defrost board. First the thermostat and defrost heater to be checked, if both check ok by meter and visually, then its defrost board causing the problem. IN YOUR case, defrost thermostat is already got replaced, so ignore thermostat, but other two possibilities needs to be checked.----------You can get required parts from from online sites like: --- www.repairclinic.com or from searspartsdirect online site. --------- This should help.Thanks.Helpmech.
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