GE Fridge...no longer freezing or cooling food!!

I have a recurring problem with a GE Profile PSB48LSRABV. Here's an example sequence:

• Fresh food compartment set to 37F on the control panel (for months)
• Thermometer in fridge reads 46F (with lots of water inside per manual)
• Press "Display Temp" button, display shows fridge at 37F
• Turn power off, count to 15, turn power on, wait for control panel to boot
• Press "Display Temp" button, display shows fridge at 46F (matches thermometer!)
• Compressor runs and cools fresh food compartment
• Hours later thermometer in fridge reads 37-38 (yeah!)
• Press "Display Temp" button shows fridge at 37F
• Within days, the fridge is warmer inside again, thermometer inside reads 45+, but display reads 37 - unit needs to be "rebooted" again!

Fresh food thermistor from top of cabinet measured properly in ice water (and warmer water), the unit has always passed all the self-tests, and condensor coils and fan are clean, so I had techs come give it a shot under home warranty:

• Trip 1 - Tech came to assess, ordered new evaporator fan
• Trip 2 - Replaced fresh food evaporator fan (note new fan is working in fridge, and old fan works fine on bench)
• Trip 3 - Ordered main computer PCBA
• Trip 4 - Replaced main computer PCBA

Unfortunately, it continues the same cycle of misreading the temperature until power cycles, and taking a day off of work for each visit is getting painful.
Any ideas?

next time send the model number and brand name.usually when this happens is the condenser fan motor isn't working.pull the fridge out,remove the bottom back panel and check the fan to see if it's working,if it is check the condenser coil to see if it's filled with lint and dust,it could just need to be cleaned out but if it's that hot most likely the fan isn't running,if you get this tonight check it now,if the fan isn't running you could blow the compressor,the condenser fan blows and keeps the compressor cool enough so it doesn't overheat by moving the hot air and the heat also esscapes through the condenser coil so if that's clogged with dust the machine will run hotter than normal,if the fan isn't running you can stick any window fan back there and blow it onto the compressor to keep it cool until you fix the condenser fan motor,this way you won't loose any food and if the compressor goes it's new fridge time,to much to repair.hope this helps and good luck with your machine.one more thing,i've found the fans not running and by pushing the blade it runs again,if this happens the fan could run and never have a problem or it could stop an hour later but i would change it out no matter what.if it's a G.E. fridge and the motor isn't running,most likely it will be the computer board,i've found 10 machines doing this and the temp. settings turning on and off or the evap fan motor in the freezer runs slow and then fast and the condenser fan isn't running or running slowly,this is why you have to send the brand name and model number.

The refrigerator side is at present working properly , but slowly slowly, it will also loose its cooling.This will happen because, freezer side is the side which cools first, then the refrigerator side ( also called as fridge side)., gets cooled.If freezer side is not cooling / freezing properly then fridge side will also loose its cooling ability.------------ And later on both section will loose its cooling.----------- As per the present situation, it indicates problem with compressor or problem with freezer side door not closing properly.---------- Or the temperature in freezer section is not set to proper cooling/ freezing.--------- So first inspect temperature, is it set right? If ok, then check the freezer door , is it properly closed? If ok, then its compressor problem.? The compressor is running non stop, this is indication of compressor problem.---------- Click this link below for more help:--- http://technoanswers.blogspot.com/2011/06/both-refrigerator-and-freezer-not.html ----------- Later on both section will loose its cooling. -------- This will help.Thanks.Helpmech.

thermostat

Sounds like the fan in the freezer is not working ( pt# WR60X190 ) .

Is the compressor motor running.If no check starter/overload relay.
Check to see if the condenser fan at the back underneath near the compressor is running. If no check fan.

Are the condenser coils near there warm or room temp. should be warm

Is the evaporator fan in the freezer running. It blows cold air into the fridge side through a damper in the wall between the freezer and fridge. Make sure the damper is open.

Below the evaporator fan is the evaporator coils. Remove the back cover in the freezer to observe the frost pattern. Light frost everywhere(NORMAL) or a partial pattern of ice(LOW ON FREON) or nothing(LOW FREON OR COMPRESSOR PROBLEM).

first defrost it by turning it off for 1\2 to 1 full day,put towels on the floor to catch the water,when a refridgerator gets frosted up it cant circulate the cold air,and if its one with the freezer on top then the cold air cant blow down into the refridgerator,check inside the refridgerator at the top where the thermostat cover is there will be a vent hole,it could have ice built up so much that its totally blocking the air flow.This usually happens when hot food is put in the refridgerator and causes steam,or the refridgerator runs too much caused by bad door seals,or the cooling fins on the back or bottom underneath plugged with dust and the freon gets too hot causing condensation inside the freezer which causes it to frost up,a plugged drain hole will back up water and freeze,the fan in the freezer may have stopped working,which is about a $60.00 part,and finally a bad defrost element (about a $40.00 part)which is a glass tube inside the freezer with a coiled up wire inside it that heats up at certain times to defrost any ice build up,(which is the last thing to check)

The black thing is the compressor. It should run warm but not hot. This usually indicates it's time to clean the condenser coils under the refrigerator. Try using a long soft brush and your vacuum cleaner.

Check to make sure that the fan in the freezer is running whenever the compressor turns on to cool the unit down. If the fan's not going, warmer moist air from the fridge will make the air duct frost up. The fan needs to be running to blow the cold air into the fridge section.

sounds like your thermostat is faulty
the thermostat reads the temperature of the cabinet and controls the temperature
the 1 thing to check on the uprights is the evaporator is in the freezer and that makes the cool then there is a fan that blows the air around the fridge and freezer to freeze things
now there is a cycle that hapens to cycle usualy every 12 hours and that is the defrost cycle
this cycle turns off the compressor and fan turns on an defrost element on the evaporator and heats up the coils to get rid of the ice
the ice turns to water and runs through a drain to a evaporator tray and when the cycle is finished the fridge stars up again and goes into the cooling state again
when the thermostat decides that the fridge is cold enough it turns of the compressor and so on it goes through the cycles as required
if the drai is blocked or the defrost system is not working the evaporator will get choked with ice and the fan will not beable to let air through to cool things off