I have a sub zero side by side. The refrig side is at 40 degrees but a 10 inch by 6 inch piece of ice keeps forming on the left size, back wall. What would be the likely cause of the ice build up??

Hello,

Their are 2 possible things causing the ice build up

1) the condenser coils is very dusty and must be cleaned,to clean it remove the top grill and the smaller panel behind the grill,use a vacuum to clean all the dust from the coil

2) the evaperator coil in the refrig. behind the back wall has a small refregrant(freon) leak in it and the coil needs to be replaced

I hope thats its due to the upper coil needing to be vacuumed since its something you can do at no cost,but even if it doesnt fix the problem the coil needs to be cleaned to help both the freezer and fresh food section work more efficently
if after cleaning the upper (condenser) coil and turning off the fridge to melt is away ice build up from (evaperator)coil,if the ice ball reoccurs the repair could be as much a $1,000.00 to replace the coil and recharge the refrigerant

The evaporator is behind the back wall and is probably icing up because of auto defrost problem.

DEFROST PROBLEM
The evaporator coil behind the cover on the back wall inside the freezer will ice up under normal conditions. Every 8 to 10 hours for around 20 minutes the defrost timer (or in most newer models the electronic adaptive defrost control) will turn the defrost heater on to melt the built up ice. There is a defrost thermostat which prevents the heater from overheating the freezer by breaking the heater circuit when the temp reaches close to 32 degrees F. The entire cooling system shuts off during the defrost cycle and starts back when the timer advances through the cycle.

If this ice is not melted it will continue to build up until the air can't flow over the coil to circulate the cold air through the freezer and into the fridge. The temperature change in the fridge is usually noticed first followed by the freezer.

If the defrost thermostat is bad, it can prevent the heater from coming on OR it won't turn the heater off when it gets too warm. It is clamped to the evaporator coil at the top to sense the temp. If it appears to be misshapen it is bad.
With an ohm meter it should show continuity when cold and none when warm.
You can also bypass(disconnect the two wires plugged into it and twist them together) the thermostat to see if the heater comes on then. If it does then you know the thermostat is bad and needs replaced.

The defrost heater is located on the evaporator. It is in a tube which is at the bottom and can also go up the sides of the evaporator. On some types you can see a burnt spot if it's bad. With an ohm meter it should show continuity from end to end when disconnected from the wiring in the freezer. You can also test the wiring for voltage when it's in the defrost mode.

If you have a defrost timer you can test it. It can be located under the fridge behind the kick panel on the front. Some are in the fridge with the controls at the top. You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer because that means the timer is not running. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.

If you have an adaptive defrost control instead of a timer, replace it if the heater and thermostat test good. It is located in the fridge with the controls in some models and on the back in others.