| It could be 3 problems:
1. Bad defrost thermostat, which clips onto the cooling coil in compartment you found wall of ice. These defrost stats are usually an approx. quarter dia. size object with 2 wires, and they have op ranges printed on them that may say something like 36-55, or something like that. In order to test for bad, the test must be done when cold/iced and you should read continuity across wires. If open, it is shot. You can also unclip, unjack wire connectors, insert in crushed ice, and test.
This was problem on MY last frozen coils call not long ago, and new one fixed her up.
2. Defrost timer clock is not running or somehow contacts inside are bad.
3. Bad heater/element. You can disconnect leads to them that are back by your frozen coils and ohm test between each end with power to fridge disconnected.
4. IF frozen ice only confined to bottom area of coils, you may have plugged defrost line that does not let the thawed water out of freezer pan under the coils.
Check that stat first and post back finding so we can further instruct if necessary.  |