arc fault breaker not tripping when wires are burnt in bedroom
I purchased a new home and the lights would flicker in the two upstairs bedrooms when we used an iron. Thinking that the problem may be with the iron we plugged it into other rooms in the house to test this theory and the lights didn't flicker in those rooms.
We contacted the home builder and they sent an electrician out to check it out. I showed them what I described above. The electrician didn't take the light fixtures down to check them, he said that with the arc fault breakers this was normal.
I decided to install a ceiling fan in one of the bedrooms upstairs and when I removed the ceiling light fixture I noticed the wires and wire nuts were burnt and melted. I decided to check the other bedroom upstairs also and found the same problem.
I checked the breaker box and found that both upstairs bedrooms are wired to one 15Amp AFCI. I counted the # of switches in each room and found a total of 4 light switches and 15 electrical outlets wired to the one breaker.
I contacted the home builder again and they sent an electrician out that didn't seem to know much about it and said it was beyond his knowledge and would let the builder know to send out a troubleshooter.
Four weeks later we have still not seen anyone to troubleshoot and when calling the builder they said they would replace the ceiling light fixtures.
Any suggestions on what would cause these problems and how to resolve this?