Sub-Zero Refrigerator Lights Are Off - How Can I Fix?

As a rule issues with your Sub-Zero refrigerator need a thorough check of several parts when the lights have gone off. Your unit can be freezing and cooling as usual despite the lights aren’t working. If the light in your refrigerator is not working, obviously the first thing to do is remove the light and replace it with a new one. If you do not have an extra light bulb for your fridge, simply check the bulb to see if it is bad by checking the filament. Shake the bulb lightly, you can hear the small pieces moving around if the bulb is defective. Replace it with a new one. If you have not yet found the cause of the problem, it is likely that a stuck or faulty door switch is causing the lightbulb to fail. With the door open, locate the plunger-type switch lever in the door frame. Depress it and release it several times to see if this frees up the action. Over time, these buttons can become stuck from a build-up of dust or dirt, which may require simple cleaning with a cloth and warm sudsy water to loosen it. Make sure the control board works properly. The motherboard (also known as main board) controls everything so theoretically everything that fails like lights or other parts on your Sub-Zero refrigerator can be caused by the motherboard. The trick is to determine if the problem is the board or something else. With the expense of these boards there is no need to replace one unnecessarily. Contact our customer support to detail some symptoms that are commonly caused by a faulty motherboard on this type of refrigerators. We also recommend checking the door gasket for defects. This part often gets overused with time and loses its efficiency.