Hello, I need a SANYO thermistor for my CMH 3172 mini split.

SOURCE: air conditioner operation light on

Does the evaporator come on?

SOURCE: Hello We just installed a Sanyo KHS1271 mini-split

The condensate drain line was not properly installed. Make them pull the wall unit and correct the problem.
Be persistant until you are satisfied they have the problem corrected. Do not pay any additional money. If they do not correct the problem then report them online to the state board of heating and air. Fill out their requested complaint form and follow thru with a second complaint if you do not get total satisfaction from the contractor that installed the unit.
Hope this helps.