Air Conditioning Compressor Constantly Running
Our air conditioner's compressor seems to be running long after the fan turns off. Tonight it ran for over 1 hour after the fan turned off. Is this a sign of the compressor about to break or is there something I can do to troubleshoot this problem? The air filter is clean and the unit is dust and dirt free. It's mounted on our roof and we live in Arizona. What is the typical life expectancy of an air compressor?
Answer:
If you are talking about the inside fan (the one in the furnace / air handler) then most likely you have a sticking contactor. Allowing the compressor / condenser to continue running with no 'load' on it from the evaporator (fan) isn't good for it, and will definitely shorten its life. The contactor is inside the condensing unit and generally isn't something that a homeowner should try to fix (high voltages and all that). Time to call a professional. I've seen published numbers for A/C life from eight to 15 years. I've personally had well maintained systems go twenty years or more, but a system of that vintage today is inefficient compared to what is available now. At some point you are better off installing a new system than continuing to have the old one repaired. If you are not familiar with doing repairs on central air systems...i suggest you call a hvac contractor who is qualified . The tech can also go over the rest of the system and do maintenance on it and do various checks with instruments which you dont have. Trying to save money by DIY , can often be dangerous or, cost you more in the long run if you destroy something else.