The freezer defrost function wasn't working and the evap was freezing up, causing temps in the freezer to warm up to 20-30 degrees F. I did some research and decided to change the defrost heater (upgrading to the two element unit) and also changed the thermostat switch. This didn't fix it so I replaced the motherboard. I don't usually throw replacement parts at a problem hoping it will be fixed, but this time I did. Shame on me!So at this point, the unit has a new heater, thermostat and motherboard.
Today, I happened to notice that there was no fan or compressor noise coming from the unit. I opened the freezer to see the glow of the heater below the evaporator and heard some sizzling noises as Ice melted down and dripped onto the heater. All was fixed I thought! But it seems as though the defrost function doesn't stay on long enough. There is still ice on the interior panel that covers the evaporator and freezer is still running warm at 20 degrees F well after the defrost cycle. I haven't removed the cover to look at the coils, but I think there is still ice and frost. Evap fan seems to be running properly.
Is there anything that I can adjust to prolong the defrost heater to fully defrost the coils? What determines how long the defrost cycle runs? When free of ice and frost, the freezer cools great, reaching 0 degrees F rapidly.
Is there a way to manually activate the defrost cycle? I'm guessing that there isn't considering the electronic controls.
Does this unit have a defrost timer? My understanding was that all defrost operations are controlled by the motherboard.
What is my next step? I've been struggling with this freezer and I've gotten really fast at defrosting it, but I want it to work properly. The wife is giving me a hard time about it. She wants a new stainless steel fridge.