Probable Faults of No Frost Refrigerators
Full No Frost refrigerators are modern refrigerators that don’t need to be defrosted. They have one compressor, one evaporator located in the freezer, and a built-in coil that periodically turns on and defrosts the evaporator. The refrigerating chamber is cooled by the cold air from the evaporator which is driven to the compartment by a fan through special ducts. Here are the main breakdowns in which a No Frost refrigerator does not freeze well.
1. No Frost defrost has failed.
Because of this, there is a lot of ice in the evaporator, its cooling capacity is decreased, and therefore the temperature in the freezer is high.
When the air ducts from the evaporator to the refrigeration compartment freeze, it stops cooling.
One or more defrost elements fail:
– fusible fuse;
– Defrost sensor (defroster);
– defrost timer;
– Defrost heater.
2. Fan is broken.
Cooling air does not circulate through the freezer and cooler compartments, and the temperature in the freezer compartment rises.
Fan motor breaks down or blades break.
Pay attention! Often the failure of No Frost defrosts leads to fan failure. The ice on the evaporator builds up, blocks the rotation of the fan, and puts it out of operation.
3. Fridge compressor.
Has lost capacity and is not generating enough pressure to cool.
4. Faulty freezer temperature sensor
It is causing the freezer’s cooling to turn off. The sensor gives the signal to turn off cooling early, so the temperature in the freezer compartment rises.
5. Freon leakage
In Know Frost models, the evaporator is the main source of leakage. It is made of aluminum, which is prone to corrosion.
6. The capillary line is clogged.
The Freon circulating through the refrigeration circuit reacts with the compressor oil. As a result, paraffin is formed, which is deposited in the capillary tube and prevents the flow of freon through it.
7. The freezer seal is damaged or pressed through.
This causes warm air to enter the chamber and causes the freezer temperature to rise.
8. The hinges of the door in the freezer compartment are deformed
This causes warm air to enter the compartment and causes the temperature in the compartment to rise.
9. Control unit.
Malfunctions and shuts down the compressor before the freezer compartment reaches temperature.
Possible malfunctions of two-compressor refrigerators
In two-compressor refrigerator models, each compartment has its own refrigeration circuit and motor that cools it. Therefore, if there is a malfunction in one of the compartments, the other one works fine.
Most two-compressor models have a “weeping” defrost in the refrigerator compartment, and the freezer compartment needs to be defrosted manually. Here are frequent breakdowns of such refrigerators when the freezer compartment does not work well.
1. Temperature sensor or freezer thermostat
Due to the failure of the node, the freezer compartment cooling shuts down earlier than it should, and the refrigerator weakly freezes.
2. The freezer compressor has lost capacity.
For this reason, it is not generating enough pressure to cool the freezer.
3. Freon leak in the freezer circuit
Occurs in the freezer evaporator or in the steel perimeter heating circuit.
4. Capillary tube clogging
The capillary tube becomes clogged with products of interaction between freon and oil from the compressor. As a result, the motor cannot pump enough freon for cooling, and the freezer freezes poorly.
5. Freezer door seal
Pressed or torn and warm air enters the chamber.
6. Freezer door hinges
Deformed, freezer door warped, and warm air gets in.
7. Control board (electronic controller)
The malfunction module cut off freezer cooling earlier than needed, that is why the chamber does not freeze well.
Can’t solve the problem with your refrigerator by yourself? Call an appliance repair service in San Diego County
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This is already the second article about fridge breakdowns, you can read the first one