HVTB18DABB lower zone doesn't cool below room temperature.

That would be a warranty issue, but wonder if you are reading set temperature, ambient temperature or 'set back' temperature? Contact the maker.

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Air conditioners can only drop the temperature of the room temperature a maximum of 15 to 20 degrees F. A 95 degree F room temperature can drop to a maximum temperature of 75 to 80 degrees F. If the room temperature drops from 95 to 85 degrees F, Then the problem is having too small of a btu rating on the air conditioner or refrigerant has leaked out the sealed system which can affect the amount of cooling performance. You will have to buy a higher rated btu rated air conditioner if the temperature of the room drops by only 10 degrees F. Air conditioners are rated by how much heat that can be removed each hour. The more humid it is, the more work an air conditioner has to do. They cannot do more work than the btu rating that is listed on each air conditioner.

the processor cooling fans for the CPU and case fans are 3 PINS.. you can use them but remember that these are 12V fans. once its the same power it will work. Ps if needed you can cut the connects from your old fan and connect it to the new ones to get it to fit properly..

When the environmental temperature is lower than the set range, the display will indicate "LO".
Lowering the temperature you have it set on, should resolve the problem.

Hope this helped you and thanks for choosing FixYa.

Sounds like the rear coil may be stopped up with dirt, etc. If it is, the unit will not cool properly. You may just be able to unplug it and wash it out with a hose and sprayer from the back of the unit. If its real dirty, you will have to pull the unit out of the window, take the case off and clean it real good. If you wash it out from the back, be sure you can do it when you can leave the unit off for an hour to dry. Let me know if I can help you any more of if this doesn't work. Stay cool. mark

does the compressor run ? if so you could have a low refrigerant charge, a sealed unit resrtiction, leak or defective compressor.

You should have at least 5,500 BTU's for that size room. Clean the filter. Turn it on and let it work for a few hours.

I have the same problem. When I first discovered this, both fans had stopped working and the temp for both zones was over 80. So much for the wine that had been stored there. After leaving the unit unplugged for a few days, the fan for the lower section started working again but the upper fan is still overheating. Haier customer service says too bad, so sad (I discovered this problem in the 13th month of ownership). I'm sure it is not worthwhile to fix this so it is going out with the trash and I'll look for a different brand for the next wine cellar that I purchase. Any ideas?

go here: http://www.partlinx.com/haier.asp
andsearch for the part. You have to start with your state, and then gofrom there. For my area, the remote is 19.99, plus shipping and tax.Also, try eBay. You can find a lot of things there!

If all you are doing is messing with that relay and then it hits the right temp, change the relay. I think the failure is a coincidence.