The door and the glass Part 3 of 4 in this group
LED Lighting and the Door Switch
The lights that show the collection through the glass, and the switch that tells the unit its door is open.
Lighting faults on a wine cooler come in two opposite forms: lights that will not come on and lights that will not go off. On the island, where wine doors are opened often and some kitchens take strong afternoon sun, both matter, because light inside the cabinet is also heat.
Lights that stay off
Sub-Zero’s undercounter guides say a door left ajar disables the lights to keep their heat out: shut it properly, wait an hour, and call if they stay out. On the current Designer undercounter line the LED lighting is a service replacement rather than a bulb for the owner. Older UC-24 units took an owner-changeable 25-watt bulb.
Lights that stay on
With the door shut this is more often a setting than a fault. Accent lighting is meant to stay lit: the UC-24BG carries its own accent-lighting switch inside the cabinet, and Designer undercounter glass-door models offer high, medium, low or off. Sabbath mode on Designer undercounter models also keeps the interior lights on, dimmed, until it ends by itself after 74 hours. If none of that applies, the switch is the suspect, and lights burning in a closed cabinet are a quiet source of heat, one reason a zone creeps off its set point; the note on zones drifting apart covers the others.
A door alarm chiming with the door shut is worth mentioning too; together the two point at how the unit senses the door. A failed switch or light is replaced as a wine storage repair.