A faulty circuit board or worn wiring can cause HVAC system failure, including air compressor failure, which is a costly problem. That's why HVAC maintenance technicians not only examine the boiler or air conditioner, but they also examine all related components inside and outside during an annual inspection. A broken thermostat is one of the most common problems in most HVAC system faults. There's good news: it's a simple and affordable repair for your heating or cooling system.
The bad news that the problem is the thermostat is that it usually won't be obvious to you. As a result, you'll likely need to hire a professional technician to discover the problem. If refrigerant levels are low, the condenser will work harder than it should, which consumes much more energy and can result in an expensive repair or total failure of the HVAC system.