Haier refrigerator hrf15n3agas will run only once per day??

[Pont 46]

Haier hrf15n3gas

serial # hm712426

I like the style and features of this fridge and seems well built,,,, but

2 1/2 year old was not cooling  or freezing . checked evaporater  fan working. fridge not filled with too much food, all vents clear. 

error code tells me fridge is normal, no error,  also fridge with not go into test mode, example test mode one is fridge to run, it doesn't run at all.

I thought is was  bad inverter checked inputs at inverter  , getting 120 volts and other connection  2.5 volts vdc, i think i should be getting 4-6 volts?  Checked three terminals on compressor and getting 7 at each terminal.

Well i got a new inverter and now, fridge didn't start right away and didn't work in test mode, but next day fridge did start and run for hours and freezer did freeze and fridge  did get cold, but it doesn't maintain temperature and gets warm again. but then fridge starts later in day and starts it bi=polar behavior.

I feel like its a control board issue? Should i be checking thermomister's? 

 My fault i purchased the $225.00 inverter, control board is $160, not sure how much money I should put into a $1000 fridge. 

any advice or suggestions greatly appreciated, I am willing to learn,

 

Thank you

 

[16345Ed]

Yes one thermistor out of spec can cause issues. 

[Pont 46]

ok with my novice approach i tested both thermister, both seem to be out of range, 

so ordered new ones, and will see , i tested by heating up the thermister did this i few times , hope my system gave me correct results,

thank you