The failed defrost thermostat will not accurately sense the temperature around the evaporator coils. So, even when the coils get far too cold while ice and frost continue to build up around them, the thermostat will fail to allow power to flow to the heater..
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What happens when defrost sensor goes bad?
When the defrost sensor trips, it shut off power to the defrost heater. If the defrost sensor trips because it’s not working correctly, frost builds up on the evaporator fins, eventually making the refrigerator and freezer not cool well. You can use volt/ohm meter to check the defrost sensor for continuity.
What is the most common cause of a frost free refrigerator failure?
One of the most common causes of poor cooling in a frost free refrigerator is a defrost system failure. In such a case one or the other compartment may appear to be keeping proper temperature but that too may change in a short period of time.
How do you diagnose a bad defrost thermostat?
Will a bad thermistor cause fridge not to cool?
The electronic control board monitors the thermistor and controls the refrigerator temperature based on thermistor signals. A broken thermistor could send the wrong information to the control board, resulting in a refrigerator temperature that’s too cold or not cold enough.
What does a refrigerator defrost thermostat do?
A defrost thermostat works separately to the refrigeration system and is responsible for stopping frost forming on evaporators, in order to avoid the increased costs of less efficient refrigeration.
How can you tell if a thermistor is bad?
What is the difference between thermistor and thermostat?
The difference between thermistor and thermostat is that a thermostat is a thermostat, but a thermistor is a resistor whose resistance fluctuates fast and reliably with temperature and can thus be used to detect temperature.
How do you fix a warm fridge and cold freezer? 
Why is my fridge not cooling but freezer is?
The most common cause for this condition is a problem with the defrost system. If the refrigerator freezer is cold but the refrigerator is warm, the evaporator fan motor might have failed. Every refrigerator has a set of coils called an evaporator.
How do you check a fridge thermostat?
Set your multitester to the R X 1 ohms setting. Place each of the multitester’s leads on a thermostat wire. When your thermostat is cold, it should produce a reading of zero on your multitester. If it is warm (anywhere from forty to ninety degrees Fahrenheit), then this test should produce a reading of infinity.
How do you fix a warm fridge and cold freezer?
Why is my refrigerator warm?
Refrigerator Is Too Full
If there are too many items in your fresh food compartment, that cold air may not circulate properly, resulting in a refrigerator that’s warm. It’s fairly common for a refrigerator to feel warm if it’s overstuffed, and this problem is obviously easy to resolve.
How much does a thermostat cost for a refrigerator?
Replacing a thermostat runs on the low end, around $100, compared to repairing the ice maker which costs $300 to $350.
What is the price of a refrigerator thermostat? market price of Refrigerator Thermostat in India is Rs 100/ Piece.
How do you adjust a refrigerator thermostat? 
What causes a refrigerator to not defrost?
One of the most common reasons your fridge may not be defrosting is a faulty timer. Issues with these parts are easy to diagnose, but the timer itself cannot easily be repaired. The best solution is to replace the timer.
Why is my fridge freezer frosting up?
Frost builds up primarily due to the interaction from letting warm air into the fridge freezer. To avoid this, try not to open the door too often, and don’t leave the doors open for very long. The cold air inside your appliance needs to be properly isolated from the outside temperature.
How do I know if my defrost heater is bad?
How do I know if my refrigerator compressor is working?
Why is my fridge icing up at the back?
Refrigerators can get wet and build up condensation when the warm outside air mixes with the cold air in your refrigerator. If there’s a leak in the door seal or if the door is opened constantly, the humidity of the outside air can cause the inside of the fridge to be wet.
Why does ice build up in my refrigerator?
Ice buildup occurs when warm or humid air comes in contact with the cold evaporator coils in your freezer (such as when you open the freezer door on a hot day). The coils will instantly freeze the moisture and, if there’s enough of it, it will accumulate as ice.
How do you test a refrigerator temperature control thermostat?
How do you bypass a fridge thermostat? How to Bypass the Thermostat for a Refrigerator That Is Not
- Open the refrigerator door to dial the built-in thermostat control to the coldest setting.
- Unplug the refrigerator power cord from the wall outlet and plug in the cord to the socket on the back of the external thermostat.