Rheem Air Conditioner Repair in Menlo Park: Frozen Evaporator Coil Diagnosis
Our HVAC technicians recently completed an AC repair for a homeowner whose Rheem air conditioner was freezing up and no longer keeping the home comfortable. The customer reported that the system had been running almost continuously but still couldn't maintain the desired indoor temperature.
Rheem Air Conditioner Freezing Up – Professional HVAC Repair & Diagnosis
Our HVAC technicians recently completed an AC repair for a homeowner whose Rheem air conditioner was freezing up and no longer keeping the home comfortable. The customer reported that the system had been running almost continuously but still couldn't maintain the desired indoor temperature.
When we arrived, we immediately found the main problem—the evaporator coil was completely frozen. A frozen evaporator coil blocks airflow, reduces cooling capacity, and prevents technicians from performing an accurate diagnosis. Before any testing could begin, the air conditioning system had to be safely shut down and allowed to thaw completely.
Initial HVAC Inspection
After inspecting the system, our technicians identified several operating conditions that contributed to the problem:
- Thermostat was set to approximately 50°F.
- Windows and doors were left open while the AC was running.
- The air conditioner operated continuously under an extremely heavy cooling load.
- The evaporator coil was completely iced over.
Many homeowners believe that lowering the thermostat to the minimum temperature cools the home faster. In reality, your air conditioner always cools at the same rate. Setting the thermostat extremely low simply forces the system to run longer, increasing wear and creating conditions that may contribute to evaporator coil icing.
What Caused the Air Conditioner to Freeze?
One of the most common reasons an air conditioner freezes up is restricted airflow or improper operating conditions. Open doors and windows allow warm outdoor air to constantly enter the home, forcing the HVAC system to work much harder than intended.
During our inspection, we also discovered that the system was operating with approximately 3.5 pounds of low R-410A refrigerant. Low refrigerant reduces system efficiency, affects evaporator pressure, and can contribute to ice formation on the evaporator coil. In this case, a refrigerant recharge was recommended to restore normal cooling performance.
Recommended HVAC Repair
After completing the diagnostic process, we recommended adding 3.5 lbs of R-410A refrigerant to restore proper operating pressures and cooling efficiency. Once the refrigerant level is corrected, the system can be tested again under normal operating conditions to verify overall performance.
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