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Evaporator Coil Questions

An evaporator is a device used to convert the liquid form of any chemical to a gaseous form. This liquid gets evaporated or vaporized to form gas. The evaporator coil is generally used in refrigerators and freezers where a compressed cooling chemical usually Freon or R-410A, is meant to evaporate from liquid form to gaseous form absorbing heat while doing so. In mixtures, it is used to eradicate water or liquid. Listed below are a few common questions answered by the Experts on evaporator coils.

What could cause an evaporator coil to not defrost?

If the evaporator has frozen solid the individual could check if the defrost switch is in the closed position. Unplug the unit overnight and if the coil has defrosted with the switch open, it indicates the thermostat is working fine. The individual can also check for heater resistance and if the reading shows 10 to 50 ohms this indicates a faulty defrost timer.

How difficult and expensive is it to replace evaporator coils on a sub zero refrigerator?

Replacing evaporator coils is a tedious and complicated job that needs to be carried out by professionals. It is also quite costly. It could cost approximately $600 to $700 for the parts and labor.

What does a clean evaporator coil mean in relation to proper functioning and running of the system?

A clean evaporator coil entails the following things. Removal of the cover of the box in which the copper Freon line goes into your furnace. Inspect both sides of the coil once the cover is off. A self rinse evaporator coil cleaning agent can be used to spray onto the coil. These cleaning agents are available at your local Heating Ventilation Air Conditioning (HVAC) supplier. Use a hard bristled brush to clean the coil using the fins to brush. Ensure you do not bend them. Attempting to clean the evaporator coil by yourself is a tricky job and in most cases, a certified technician can clean this for you for a charge of approximately $50.

A Samsung refrigerator’s water dispenser plastic tank and the entire evaporator assembly has frozen, what could be the problem?

In this scenario, the temperature sensor in the evaporator coil could have failed. This sensor is usually attached to the evaporator coil. It is a small device with a thin pair of yellow wires. This part would need to be replaced. Prior to replacing the sensor, the evaporator coil should have thawed completely or returned to normal status. Another thing to be noted is the heating blanket located between the evaporator and the water tank could have gotten faulty. Hence it is unable to prevent the water tank from freezing or when the evaporator coil gets very cold, the heater is unable to stop the water tank from freezing.

If an evaporator coil in a freezer is not defrosting could the problem be related to the defrost heater, defrost thermostat or defrost timer?

Below are the following ways to test each element:
• To check the defrost heater, an individual would need to check for resistance. The individual should get a reading between 10 to 30 OHMS. If you do not, you will need to replace it.
• To test the defrost thermostat, the resistance should read below 1 OHM when it is set below 32 degrees. If it does not, you may need to replace this part.
• If both of the above parts – heater and thermostat are functioning normally, the problem could be with the timer which needs to be replaced.

The evaporator coil in a GE fridge-freezer model keeps freezing resulting in no air flow to the interior, if the mother board has been replaced what else could be the problem?

Here the control board appears to be fine which means the problem could be a faulty defrost heater or thermistor. It is most likely an issue with the thermistor which is a small white plastic bullet shaped device which is clipped on the top of the evaporator coil. This part cannot be tested individually since it is wired in and may need to be cut to test and then replaced. Hence you can instead disconnect the wires of the heater and check for continuity. If it does show continuity, the thermistor may need to be replaced.

Evaporator coils are one of the most significant components which are present in appliances such as refrigerators, air conditioners, freezers and so on. They perform important functions and issues with them can cause the whole unit to fail or not function efficiently. Sometimes evaporator coil repair may need to be handled by certified professionals since they deal with refrigerants. In order to know more about your evaporator coils issues, Experts can be useful to consult and guide you. Experts can provide individuals with reliable and affordable answers and solutions.
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