In a service call for insufficient heat, if the suction pressure is higher and discharge pressure is lower than normal, and temperatures are measured, what does a discharge line temperature of 215°F indicate?

A discharge line temperature of 215°F typically indicates an issue with the heat pump system, particularly when it is combined with the scenario of higher suction pressure and lower discharge pressure. In a correctly operating heat pump, the discharge line temperature should not reach excessively high levels, as this usually signifies that the refrigerant is not cycling properly through the system.

When the discharge temperature is significantly elevated, it can imply that the reversing valve is not functioning correctly. The reversing valve is critical in heat pump systems because it allows the flow of refrigerant to change directions, enabling the system to either heat or cool the space effectively. If this valve is faulty, it may lead to improper refrigerant flow, which can in turn cause the discharge pressure to be lower than normal while suction pressure remains higher, leading to poor heat transfer and inadequate heating output.

In this context, the symptoms of high discharge temperatures and abnormal pressure readings consistently point to issues with the reversing valve's operation, supporting the conclusion that it is the likely source of the problem.