Dometic Quick Cool compressor freezing and evaporator coil

1. Refrigerant charge: If the refrigerant charge is too low, the evaporator coil will not absorb heat effectively, causing the coil to freeze.
2. Airflow: If airflow across the evaporator coil is restricted, the coil will freeze. This could be caused by dirty air filters, clogged condenser coils, or fan failure.
3. Defrost system: If the defrost system is not functioning properly, the evaporator coil may freeze. This could be due to a faulty defrost timer, a defective defrost thermostat, or a clogged drain line.
4. Compressor: If the compressor is not running properly, it may not be able to pump refrigerant through the evaporator coil, causing the coil to freeze.

To troubleshoot a frozen evaporator coil, you should start by checking the refrigerant charge and verifying that the unit has proper airflow. If the refrigerant charge is low, you should have it recharged by a licensed HVAC technician. If the airflow is restricted, clean the air filters and check the condenser coils for any blockages. If the defrost system is not working properly, replace the defrost timer or thermostat, and clean the drain line. If the compressor is not running, it may need to be replaced

A frozen compressor can be caused by several things. One cause could be partial loss of refrigerant or being over charged by someone adding to the factory charge. Another cause for a frozen compressor might be poor heat transfer in the evaporator, which is where the cool air comes from. This is usually systematic of a dirty evaporator or poor air flow coming from the fan. Another cause for a frozen compressor is the system not turning off when it should. This problem is usually a result of a bad thermostat or the thermostat not turning off soon enough.

JohnL

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Make sure the mode is set to freeze and temperature is set to below the room temperature.

If it is a split system, check the outdoor unit whether it is running. If it is running, see if you can reach and feel the temperature of the pipes connecting between the indoor and the outdoor unit. It should be cool.

If it is not cool, you may need to get somebody to check the refrigerant.

looks as evaporator fan is working. have you ever clean condensor under the fridge. possibility it is pluged with dust and not allowing compressor to cool down.
Also check the fan at the back of the fridge beside the compressor. see if it is working

You may notice frost on the panel that covers the evaporator coil in the freezer. This is a tell tale sign of the coil being frozen up blocking air flow.
Inside the freezer compartment is where the evaporator coil is located. It is behind a cover that allows air to enter the bottom and then forced out the top by a small fan. You should be able to feel the air flow coming out the top. If no air flow the evaporator coil may be frozen and needs to be defrosted. There is a heater at the bottom of the coils which aids in this and may need to be replaced. A couple of screws usually holds the cover in place. Remove the cover and place a small fan in the door to aid in melting the ice. Do not apply heat of any kind ie hot water, blow dryer etc because this can over pressurize the coils and damage the system. The heater may look like a small light bulb. It can be checked with an ohm meter for continuity to see if it needs to be replaced.

This is very much relay problem. The olden days relay get stuck due to residual magnetism. Or spring would have snapped. Or contacts would have bonded permanently. Check these or replace the relay totally.

You need to check the Condenser coils, these are copper coils of tubing usually located on the back of the unit near the ground. They need to be free of all dust and grease to work at maximumefficiencyand it is recommended to clean them every 6 to 10 months. If those coils are already clean, the next thing to do is check the evaporator fan(The fan inside the unit). See if it's running. If it's not, check the coils behind it. If the coils are frozen up then you probably have to change out the fan motor.If they aren't frozen up then there may be a refrigerant leak or a bad compressor*. In order to legally reclaim, recharge, or test refrigerants you need a special certification from the EPA. If you need to do so I recommend you call in a certified technician.
If the lights, fans, and compressor aren't working at all, check your fuse/breaker box to see if anything is tripped or blown. If the lights are on but nothing is working, The thermostat may be having problems.
*To replace the compressor you need to reclaim and recharge the refrigerants from the system.

If the evaporator is not getting cold, it could be lack of charge or the coil is dirty and not allowing the compressor to properly cool. Try cleaning the coil first.

Time to be serviced,could be a small leak and loosing freon, or low air flow due to dirty filter.,

If unit was freezing up the air flow would normally stop, until the unit is turned off and allowed to thaw. I suspect evaporator blower may have a worn out belt, or compressor is shutting off due to control or internal overheat. What is the age of the unit?