I need a replacement for the keys of my HAIER 7.3 FRREZER

check thermostat, or relay on one side or back cclose to the compressor area there is a removable lid. removed and look for a thermostat disconect the 2 wires and bridge them then plug the the freezer on if runs replace the temp thermostat for a new one should be freezer thermostat

Brenda, haier freezer control quite often front lower right corner, some may be behind freezer by compressor, check the links to see if you can find your model and manual. Check the attached links,instruction and guides, Good luck
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http://image.haier.com/manual/southeastasia/haier/freezer/chestfreezer/201203/P020120309357074931017.pdf
Haier Freezer manuals
Haier Freezer controls Google Search

The dial is more than likely the thermostat. If tapping on it brings it back on and then it cycles fine for a few days, the thermostat is needing to be replaced.

If you have run it in a tilted position, the oil has migrated from the compressor to the evaporator. You need a technician to flush the oil back to the compressor. Only run equipment like this on a flat level surface. and always allow to stand a few hours after moving before switching on.

Oil in the evaporator. It may come back if you leave it running for a few days, but usually needs flushing out.

http://www.managemylife.com/mmh/owner_manuals/1018/HAIER-Chest-Freezer-L0501492

I found the manual at the above link. The Haier freezer models include:
HCM036PB
HCM045PB
HCM050PA
HCM073PA

yes it can by replacing the pc board

It 's builded that way so there's not condensation around the door frame and on the walls.

WATH IS THE NORMAL AND LOWEST TEMPERATURE THA THE SMALL MAGIC CHEF FREEZER MODEL CUF3DS

look on the inside of the toe kick at front bottom or just inside front bottom and you will find a tech sheet that will give you error codes.