I have a 2 drawer wines cooler, just now temp.panel went out and it will not reset,or for that matter even show zero.....??????

Unplug for 5 minutes to see if it'll reset to foctory setings.

If after adjusting your thermostat to desired temp and is still cooling. The thermostat is bad or your relay is bad
If you disconnect the thermostat and the compressor stops it most likely a bad thermostat
If you disconnect the relay from
The thermostat and it stay running it is the relay. It is sticking
If possible store you wine somewhere else and shut the unit down and unplug for 10 to 20 minutes this may cause some melt of condensation some water may be on the floor if is to cold
This may also reset the system.

It depends on if there is anything in it! Those types of coolers are only designed to drop temps of wine bottles to below room temp a few degrees. They don't cool like refrigerator in your kitchen.

Our magic chef wine cooler (mcwc50dbt) when temp is set on digital panel at 45-50 it jumps immediately back to 70 degrees constantly

Hi

Please check this link to read detailed information related to wine cooler as per your query:-

http://www.winecoolerexpert.com/wine-cooler-faq.html

Please get back to us if you have further query else please accept the suggestion.
Thank you for contacting fixya.com

The error is likely caused by a bad temperature sensor. The control board may still be Okay.
Replacing both of them is recommended.

Check this link for parts: http://www.partstore.com/Model/HAIER+AMERICA+TRADING/Haier/BC112G.aspx

Clean the condenser located under the unit. This may help. However, more serious problems involve refrigeration leaks shorted thermistors and non running fan motors. All are common. I recommend an authorized Subzero tech for this unit if cleaning the condenser does not help.

change your temperature sensor, it's broken and it's going to down temperature

Check your thermostat setting, if the setting is ok then something wrong with your thermostat control.

Few things to check here. If the compressor is not running then the problem may be a bad thermostat or the compressor start device (ptc starter). Most common would be the thermostat on wine coolers. Also need to check if the fan is running. If everything is running then you have a sealed system problem. If the fan is the only thing that is not running that will cause a no cool situation.