06-21-2016, 12:27 PM
Just to add to Richards writeup...for those that are reading along at home.
The thing that was not obvious (to me) is that *all* the current to run the compressor actually flows over the leads on the circuit board. Most of us think that circuit boards carry low voltage and low current. That is not the case in these AC boards. They carry and switch high current and high voltage.
I have implemented Richard's fix and it has worked well for several months. I am no longer worried about the board having another melt down.
One last thought. There are fewer and fewer of these boards out there in the wild. They are no longer manufactured. If your board has a catastrophic melt-down it will probably not be repairable. So, in the future we may be in a situation where an AC unit will not be able to be repaired.
Like my high school chemistry teacher (Mr. Harris) said ...."A word to the wise is sufficient"
The thing that was not obvious (to me) is that *all* the current to run the compressor actually flows over the leads on the circuit board. Most of us think that circuit boards carry low voltage and low current. That is not the case in these AC boards. They carry and switch high current and high voltage.
I have implemented Richard's fix and it has worked well for several months. I am no longer worried about the board having another melt down.
One last thought. There are fewer and fewer of these boards out there in the wild. They are no longer manufactured. If your board has a catastrophic melt-down it will probably not be repairable. So, in the future we may be in a situation where an AC unit will not be able to be repaired.
Like my high school chemistry teacher (Mr. Harris) said ...."A word to the wise is sufficient"
Bill Johnson
Birmingham, Alabama