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In class, I always tell my students to ask themselves why something has happened in order to trace the system back to the initial cause for system failure. Here's a quick example:
You go on an air conditioning service call and the customer is complaining that the system is not cooling the house. You gauge up on the system and determine that the compressor is operating, but the high and low sides pressures are the same. You check the compressor and determine that the valves on the compressor (yes, it's a recip) are leaking. You replace the compressor... Lo and behold, a few weeks later you are back on the job replacing the compressor again... Hmmm... Here's how things could have gone a little better.
You gauge up on the system and determine that the compressor is operating, but the high and low sides pressures are the same. You check the compressor and determine that the valves on the compressor are leaking. Why are the compressor valves leaking? Probably because liquid refrigerant has gotten into the compressor. Why has liquid refrigerant has gotten into the compressor? Because there was liquid in the suction line. Why is there liquid refrigerant in the suction line? Because the evaporator is being overfed. Why is the evaporator being overfed? Because the TXV is fully open. Why is the TXV is fully open? Because the thermal bulb is hanging freely in the return air stream. Why is the thermal bulb hanging in the return airstream? Very likely because the guy who was there had no clue about what is to be done with the thermal bulb on the TXV.
Yes, you will still need to replace the compressor, but in addition to the compressor replacement, you will also have to resecure the thermal bulb.
So, why am I mentioning this to you all? I was down in Orlando Florida for Thanksgiving and stayed at my sister-in-law's house. She asked if I could replace the toilet in her master suite as the water continues to run and keeps her up at night. I told her that the parts in the tank could easily be replaced and that there was no need to replace the entire toilet. She told me that all of the parts in tank have already been replaced twice by two different plumbers and that the problem still persists and she wants the toilet replaced. No problem.
I look at the toilet and notice that the float assembly in the tank is brand new, but the flapper assembly looked like Noah had it on the ark with him. She showed me the paperwork from the two plumbers and they both replaced the float assembly. Wow!
The complaint wast that the water was continuously running so they replaced the float... TWICE!
I was astonished that they simply did not ask themselves why the water was running. How about.... the water is running because water level in the tank is going down. Why is the water level in the tank going down? Because water is leaking out of the tank. Why is water leaking out of the tank? Because the flapper is not making proper seal at the bottom of the tank.
The poor float was just trying to maintain the correct water level in the tank.
So, $12 later the water has stopped flowing and my sister-in-law can sleep!
Hope you all had a great Thanksgiving!