What happened today. I got a call from the number which I didn't know this morning and it become a day I didn't expect. Personally, I tended not to answer to the phone number that I didn't know so I hesitated to get it first, however eventually I answered to it since he called a couple of times while I was avoiding. It turned out that the call was from the owner of Korean grocery store where I had been for shopping sometimes and he who knew what I am doing asked me to repair a store freezer. This is what happened, first of all, I have been managing air conditioners and heating of rental houses and company so I assumed that he remembered me and believed that I might help him because he was afraid of melting his stuff that was in freezer. He told me that what happened to his freezer and wanted me to come for checking. The problem was that I was not supposed to repair other ones because of laws. So that I explained about it to him, but told him that I could come and help him while the mechanic was repairing it as his major problem was a bad communication with a mechanic. According to him he already had a mechanic fixed several times but he wasn’t satisfied with his work because of result the mechanic made. Though he was owner of store expecting enough fluent speaking English, but he was not Second, when I arrived at the store and asked about the trouble he had, he showed me the temperate of freezer telling seriously that it has been showing -15 degree and it was showing + 4 degree which could be able to make his stuff melt completely. However when I looked at it closely the unit was Fahrenheit but he assumed that it was a Celsius that is unit most Korean use and familiar with. That meant it wasn’t problem in terms of melting stuffs as the +4 degree of Fahrenheit was equivalent to -12 degree of Celsius. Anyway, when I checked the thermostat to see the designated temperature, I found that it was set + 4 degree of Fahrenheit which the mechanic set it up because of the bad communication with owner about a week ago. In summary, I changed the thermostat from +4 to -15degree of Fahrenheit then it started decreasing the temperature immediately like the owner wanted. Sometimes the basic of anything and checking calmly are so important to avoid the unnecessary things.