In this month’s troubleshooting problem, the equipment that needs servicing is a split system heat pump, manufactured under the brand name Grandaire (ICP, Lewisburg, Tennessee). The indoor unit model number is WAPT304A2, and the outdoor unit model number is WCH5304KGA100. This is a 2.5-ton unit in a residential installation.
The information you receive from the dispatcher is that the customer explained the unit is operating erratically. Specifically, when the thermostat is satisfied at the end of a cycle, the compressor shuts down, but the outdoor fan motor seems to continue operating at a slower-than-normal speed.