wngtan

Any one has mr quek or mr ong contact anymore.

I had the same problem. According to my A/C guys, it is because of wiring problem. Somehow, inferior wires were used a few years back. I had to change 4 wires last week because it is a Mitsubishi Industrial System 4. It cost $320 + 7%GST. You can surf internet to look for guys who are trained to do such things as it is cheaper.