GE Model: TFX24ELM SideXSide Compressor on constantly to cold in Fresh Food compartment.

[FastEddie746]

GE Model: TFX24ELM SideXSide.  Setting of "A" and "1" Compressor on constantly.  Freezer -5 degrees, 25 degrees in Fresh Food compartment.  It may stop once a day for 5 minutes.  This is what I have tried so far.

Diagnostic Test is NORMAL.

I replaced fresh food gasket and cleaned the coils underneath the unit.

I replaced temperature control thermostat - no change (old thermostat tested OK later)

Pin 10 (cube relay drive) of electronic control system read .74v should be (13-20Vdc)  In looking at 9 pin connector I saw green corrosion growing across top of connector pins.  Scrapped off and now I have 14 Volts at pin 10.

Meat control ASM was loose siliconed back into place. - Set closed.

No ice on condensor coils.

What else can be the cause of the constant compressor running.  It can't be normal.

Thanks,

ED

[Samurai Appliance Repair Man]

6 hours ago, FastEddie746 said:

Setting of "A" and "1" Compressor on constantly.

Explain what these settings correspond to, eg., Freezer coldest, Freezer warmer, FF colder, etc.

6 hours ago, FastEddie746 said:

Pin 10 (cube relay drive) of electronic control system read .74v should be (13-20Vdc)  In looking at 9 pin connector I saw green corrosion growing across top of connector pins.  Scrapped off and now I have 14 Volts at pin 10.

Irrelevant to the problem you're reporting in this topic.

The electronic control has its own temperature sensor, and early style thermistor, connected between pins 1 and 5. The tech sheet lists temperature-resistance data for this sensor. You need to verify this sensor is in spec.

 

[FastEddie746]

Yes, sorry.

 Freezer Mechanical dial setting to "A"     (A) warmer to (E) coldest  ----- Actual freezer temp -6*F  

Refrigerator Temperature control thermostat set to "1"   (1) warmer (9) coldest   -------- Actual refrigerator temp.  28*F

Spec. Thermister Readings:   90*F  37K     41K

                                                70*F 59K      55.2K

                                                55*F  87K     77.5K

                                                35*F  150K   135K

                                                 0*F   427*F    395K

 

So the thermister is off on the lower end.

 

 

[Samurai Appliance Repair Man]

3 hours ago, FastEddie746 said:

Spec. Thermister Readings:   90*F  37K     41K

                                                70*F 59K      55.2K

                                                55*F  87K     77.5K

                                                35*F  150K   135K

                                                 0*F   427*F    395K

 

I just gotta ask-- what was you methodology for changing the thermistor temperatures and then verifying what those temperatures actually were?

[FastEddie746]

I placed the thermister in a paper cup with 91 proof rubbing alcohol so it would not freeze.

The leads to my meter were attached to the thermister.  The freezer was at -20.  I pulled entire setup and connected to meter K ohms range.

I used a Robi infrared thermometer +-5% accuracy and waited for the temp threshold to take a  reading.  I assumed the surface and submerged thermister were the same temperature.

 

So you think replace the thermister?    ;0 

 

Thanks ED