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.
Your freezer actually cools your fridge. It sounds like you have ice build up in your freezer behind the back panel. You should be able to unscrew the back wall inside your freezer. A hair dryer should help defrost or keep it open for a few and use a screwdriver to remove the build up of ice. The ice has made its way down the vent and when it hits the fridge it is above 32 degrees so it is melting. Hope this helps. I manage rental properties and have had it happen on a few occasions.
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.
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
this water should be evaporated by the motor heat.however, i have found with larger larder fridges of several makes that too much water is formed for it all to go.
worth while checking the door seals as well as if seal is leaking, more ice forms on the evaporator and hence more water