Blown 5 amp fuse on Carrier System
Hello, I have a Carrier central unit that keeps blowing a 5 amp fuse on the control board of the air handler/blower.
Problem began about a week ago when we went to adjust the thermostat and the digital display was blank.
Upon further inspection we discovered the 5 amp that had blown.
Upon replacement, the thermostat came back but the fuse blew again when the heat tried to turn on.
After this we inspected the wiring at the outside unit and found no apparent problems. We disconnected the main black wire from the outside unit and replaced the fuse, and the display came back again and the fan worked inside. When we reconnected the black wire at the outside unit it ran fine on Heat, and EHeat for about a week and has just blown again this morning.
I'm beginning to believe there is a short somewhere in the wiring to the outside unit. Both times we blew fuses it had rained heavily in the previous 12 hours.
If anyone can offer any tips or suggestions to help us speed along the diagnosis to our problem I would greatly appreciate it!
Last edited by chalkstar; 12-25-2008 at 08:09 AM.