I found this to be true once when I visited a condominium complex. I was apprised that a condensing unit in the complex was not running. A quick check of the voltage and fuses in the electrical disconnect ruled them out as possible causes for the identified failure. I then dropped the electrical control panel cover on the unit. I found the thermostat wires had separated and were not making contact. Thus, there was no current to the contactor coil.
Fortunately, the transformer was not shorted out.
After installing the proper size of wire connectors, I checked five other condominium units. You’re probably wondering what I found. You guessed it - oversized wire connectors were installed on the five units. My speculation is that the remaining residences in the complex have the same problem. This problem could have turned out to be a very costly service call for all the condominium residents.
Conjecture would point to two groups who would have responsibility for this: the installing contractor and the local code office. Some or all of the following items may be the cause for the problem:
The local code office:
Whatever cause(s) for the wire connector problem in this case, the lesson for all of us contractors and technicians is to be careful on the job when installing or servicing equipment, for a simple mistake could cause a big problem later.
Publication date: 01/29/2007