A _______ might indicate a sign of system blockage.

A sign of system blockage can be indicated by multiple symptoms within an air conditioning or refrigeration system, including higher amperage draw, warmer than normal evaporator temperature, and higher than normal head pressure. When there is a blockage in the system, it can restrict the flow of refrigerant, leading to an array of issues.

Higher than normal amperage draw occurs because the compressor has to work harder to move the refrigerant through a restricted path. This additional strain can indicate that something is impeding the normal flow.

Warmer than normal evaporator temperature results when the refrigerant is unable to absorb enough heat from the indoor air due to reduced circulation. If the evaporator coils are not effectively cooling, it can lead to warmer temperatures than expected.

Higher than normal head pressure is another indicator of blockage. If the flow of refrigerant is restricted, pressure can build up in the system, particularly at the condenser side, leading to elevated head pressures that signify an abnormal operational state.

Since each of these conditions can independently suggest a blockage in the system, the correct response recognizes that all of these signs are interrelated indicators of potential system issues.