Evaporator Coils only Frosting on top half

Sounds like you are low on refrigerant

Remember that most all refrigerators only have cooling to the freezer... the refrigerator depends on stealing some of that cold to be cool, so here's my top 3 guesses...
Cause 1 The defrost heater is defective, so frost accumulates on the evaporator coils, and the coils will become plugged with frost causing the airflow through the coils to be restricted, and the refrigerator not to cool. Check the evaporator coils to determine if they are frosted over. If the evaporator coils are frosted over, test each component of the defrost system after clearing any restrictions to the cooling fan and defrosting with a hair dryer.
Cause 2
The evaporator fan motor draws cold air over the evaporator coils and circulates it throughout the freezer. If the evaporator fan is not working, the freezer or refrigerator will not cool adequately. To determine if the evaporator fan motor is defective, try turning the fan blade by hand. If the fan blade does not turn freely, bench test it for function and use a multimeter to test the motor windings for continuity. If the windings do not have continuity, (very odd) replace the evaporator fan motor.
Cause 3
Damper Control Assembly The air damper control opens and closes to let the proper amount of cold air into the refrigerator compartment. If the damper does not open properly, it won't let enough cold air into the refrigerator. Check the damper control to determine if it is broken or stuck closed or that an inadvertent bump has shut it off to the refrigerator compartment

Remember that most all refrigerators only have cooling to the freezer... the refrigerator depends on stealing some of that cold to be cool, so here's my top 3 guesses...
Cause 1 The defrost heater is defective, so frost accumulates on the evaporator coils, and the coils will become plugged with frost causing the airflow through the coils to be restricted, and the refrigerator not to cool. Check the evaporator coils to determine if they are frosted over. If the evaporator coils are frosted over, test each component of the defrost system after clearing any restrictions to the cooling fan and defrosting with a hair dryer.
Cause 2
The evaporator fan motor draws cold air over the evaporator coils and circulates it throughout the freezer. If the evaporator fan is not working, the freezer or refrigerator will not cool adequately. To determine if the evaporator fan motor is defective, try turning the fan blade by hand. If the fan blade does not turn freely, bench test it for function and use a multimeter to test the motor windings for continuity. If the windings do not have continuity, (very odd) replace the evaporator fan motor. Cause 3
Damper Control Assembly The air damper control opens and closes to let the proper amount of cold air into the refrigerator compartment. If the damper does not open properly, it won't let enough cold air into the refrigerator. Check the damper control to determine if it is broken or stuck closed or that an inadvertent bump has shut it off to the refrigerator compartment

yes it is possible , it could have caused a restriction. if evaporator coil has a slight frost pattern from top to btm then your compressor and Freon are good and no restriction . if your evaporator coil is only frosting up only a little then you have a freon restriction.

if you just cleaned the coils today , it takes up to 24 hrs to get back to 100 % .

Frosting on evaporator coil should be evenly distributed all over the coil. If the frosting only appears up on the top around where the refrigeration line enters then the gas pressure is too low - if you add refrigerant the frosting will move down to cover the bottom coils also.

Where is it frosting, condenser or evaporator? If you mean frosting on evaporator line to compressor, probably iced up evaporator. If you mean frosting after condenser by capillary, unit short of gas/ blocked.

The freezer not freezing can be 1 of 2 problems, the first being a defrost issue. If the defrost timer or defrost thermostat are bad they will not activate the defrost heater in order to keep ice from building up on the evaporator coils. In order to find out if this is your problem, remove the panel off of the inside of the freezer to expose the evaporator coils. If there is a lot of ice build up, this is your problem. The second problem will be that the compressor is low or out of freon. You will know if this is your problem if the evaporator coils are only partially frosting, there will be NO ice on the coils if this is your issue. This problem can only be repaired by a certified technician. If it ends up being just a defrost problem you can order the parts to repair it at Reliable Parts, using your model number to look up the parts. For information on how to perform your repair, please reply.

Thanks, Repairman45

Hello,

Sounds like a defective defrost timer
If its a frost free upright freezer and the evaporator is frosting up with a snow like frost you have a defrost problem.. defrost themostate, heaters, or timmmer
Also note that
Dirty condenser coils are not the problem. It's most likely the defrost timer or defrost heater. The heater should come on about 3 times per day to melt the ice on the evaporator coils. If the defrost timer is not turning on the heater or the heater is burnt out, the coils will freeze up......

Hope this helps

Hello,

Sounds like a defective defrost timer

If its a frost free upright freezer and the evaporator is frosting up with a snow like frost you have a defrost problem.. defrost thermostat, heaters, or trimmer



Dirty condenser coils are not the problem. It's most likely the defrost timer or defrost heater. The heater should come on about 3 times per day to melt the ice on the evaporator coils. If the defrost timer is not turning on the heater or the heater is burnt out, the coils will freeze up

Hope this helpout and Good luck

Are you frosting up at the condensor or did you mean the evaporator? If its the condensor then make sure the coils are clean. Still then you will need a tech to look at the seale system. If its the evaporator and the heater is ok then it could be the timer or the terminator on the compressor. Most of the time its the timer.