I have a larder fridge and ice keeps forming on the inside back wall of it, very thick layer of ice actually. Not sure if it could be the door seal as sometimes doesn't shut properly, would this cause ice?
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If your fridge is built into the furniture, pull it out by releasing all the retaining screw, clean the condenser and the areas behind your fridge. Dust and fluffs reduce the efficiency of the fridge. Also turn the dial to three, if it is higher, older fridge do not need to be cranked to higher numbers. If no joy call an engineer, the level of refrigerant in your system may need topping up. Will cost you anything from sixty pounds for a qualified engineer to do this.
It can be 2 things. One is that the thermostat is broken but then it will also freeze your food. The other reason is that it has lost part of its gas charge due to a leak on the system causing the unit not to reach temperature thus not switching of on the thermostat and building ice inside. Normally it is not economically viable to fix the unit.
The ice forming on the back wall of your sub zero indicates that you have a part failure. I don't recall exactly what the part is but as soon as you mention your symptoms to a sub zero repairman he'll know your problem. It's an easy fix. Everything comes out of the fridge, takes the inside back wall off and replaces the part. Not an inexpensive repair, however the part is guaranteed for 5 years so you may have an opportunity to have it replaced under warranty as I did.
One reason for the fan running is that it is trying to distribute the air in the compartment. Look at the very rear of the freezer on the bottom and see if the little vents, which allow water to disperse, are not filled with frozen ice. If so, turn off the fridge (unplug it) and use a hair dryer to melt that ice until it is all gone. That will probably fill the condensation pan under the unit and you'll need to empty it.
problem could be door seals not sealing completely and hence excessive ice formed on evaporator and excess water when it melts. however, i have found this problem many times with large larder fridges and really found no cure.
towards the bottom of the back wall, there is a gulley with a drain hole in the middle. this drain is blocked. clear it with something flexible and make sure water flows away freely
problem could be one of two things.
insulation breakdown will cause an iceball to form.
if the compressor is failing, then frost line does not reach the thermostat poisition and compressor runs all time and an ice ball will also build up
in either case, not worth repair