In this troubleshooting situation, the equipment you’re servicing is a 240-volt, single-phase split system in a small office, and the customer’s complaint is that the system is blowing warm air. The customer also told the dispatcher that the office had the same problem at the beginning of the cooling season last year, at which time a different company was called out, and a part was replaced. According to the customer, the unit operated OK until now.
When you arrive, you find the while the indoor and outdoor fan motors are operating, the root of the problem is that the compressor is attempting to start, but kicks off on its overload. When you remove the access panel, you check the schematic and note the wiring configuration for this compressor, shown in Figure 1.