2008 Lennox Model XC16-048-230-02. Above is the A/C model. Maybe it is easier to have the model to talk about the problem. This year, I have two technician checked my ac system. First one just changed a wire on the board within the indoor unit. Only works for several days. The second one jumped DAS sensor. He said the sensor is not working well because the code reads frozen coil but there is no frozen sign he could see. After he finished the work. It worked for half a month. Now the problem occurs. last weekend, when we turned on the A/C, the air flow is going but the temperature is not going down. So I went outside and the compressor and fan is not working. There is no sound outside. I restarted the ac but the outdoor unit only worked for a couple of minutes and stopped. Last night, Set temperature was 78 but the room temperature was at 82 F. The outside temperature in my cellphone app shows 75~76 F. The outside unit is running for only a couple of minutes. Is it the problem of zone board sensor? The technician checked the compressor and refrigent. They are ok. He listed the problem as the DAS sensor. Not sure about what to do...

Hello, The issue I am having currently is my house AC unit not spitting out the right temperature differential consistently. For example, I have a programmable stat that is set at 72 when I'm home and 74 when I'm at work. When I come home in the evenings, the house is still at 74 just running along and only spitting out around 71 degrees out of the vents. My solution thus far to fix this is to switch the stat to heat mode, wait the 5 minute delay, let it run in heat for about 60 seconds, switch back to cool mode, wait the 5 minute delay, then read the temp out of the vents again. When I do this, the temp starts spitting out 58 degrees and the house takes about 60-90 minutes to get to 72 degrees and eventually shuts off. When it turns back on, it continues to spit out 58 consistently the rest of the night. Then the next day, the whole process starts over again. I figure it can't be low on refrigerant considering it puts out 58 through the vents when it's working normally. Also, this past weekend was cooler (only 72-75 outside) plus it stays at 72 since I'm home all day and it worked normally and put out 58 degrees. However, as soon as it goes back to weekday mode and sets to 74, something goes wrong and it will only spit out around 71 degrees through the vents. Any ideas what the issue could be? I don't understand why it works normally until it needs to cool from 74 to 72 and that it consistently spits out 58 degrees from the vents when it's working right. And I don't understand that my only solution to fix this is switching the reversing value from heat back to cool to get it to work right. I'm considering just leaving the house at 72 all times to not mess with it. Thanks for the help!