Freezer won't cool below 45 F

Freezer won't cool below 45 F I discovered the other day that the temp in the freezer had risen to 35 F. After removing the food I discovered that there was a large block of ice across the bottom of the evaporator coils — about 3” thick. The drain was clear though. After turning the freezer back on, it wouldn’t go below 45 F.
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Guest [Entry]

"Hi @blightstrider ,

Just some observations re your question:

Having so much ice under the evap unit indicates a possible problem with the auto defrost cycle. Either a faulty defrost heater, defrost thermostat, defrost timer or a blocked drain tube.

You said that the drain tube was clear. Does this mean that you checked that it wasn’t blocked at all and water could flow from under the evap unit right through to the evap pan under the freezer near the compressor?

The grey tube seems more like a drain tube or even an electrical conduit rather than a refrigerant line but I may be wrong. Can you see the end of the grey tube at all to see where it goes? If it doesn’t connect to the compressor or condenser somehow it is not part of the sealed refrigerant system

If the compressor is running continually and the evaporator unit is not getting icy cold this indicates a problem with the sealed system.

Here’s the wiring diagram for the freezer. It is useful as it show the wiring so that you can test if the defrost heater (Note: the defrost thermostat is part of the defrost heater assembly) and defrost timer circuits are all OK. The wiring diagram states that the defrost cycle is on for 30 minutes every 12 hours. It is initiated and ended by the defrost timer The supplier links are examples only to show the part, their location and possible cost. If a part is faulty search online using the manufacturer’s part number only (shown in link) to get results for other suppliers that may suit you better.

It also shows the suction and high side pressure values for the sealed system. To check the sealed system pressures to know if there has been a leak or if they’re OK you will need to access the system. Depending on your location, you may need to have a licensed refrigerator repairer do this due to the environmental regulations regarding the handling of refrigerant gases. They also have the appropriate equipment to do the checks."