Booking today · Houston service windows 9–12 · 1–4 · 4–7 Independent Sub-Zero specialists · Licensed & insured Mon–Fri 7:00 AM - 8:00 PM · Sat 8:00 AM - 6:00 PM
(713) 844-8535 Book a Repair
Error code · Refrigerator

Sub-Zero Classic BI Code 15-L-01: lighting relay stays closed

On Classic Built-In models such as the BI-36U/S, 15-L-01 means the main lights relay is stuck closed. The interior lights stay on even with the door shut, because the relay keeps feeding them power. Lights left…

Low risk · DIY check OK
Code
15-L-01
Appliance
Refrigerator
Brand
Sub-Zero
Warranty
30-day workmanship

What 15-L-01 means

On Classic Built-In models such as the BI-36U/S, 15-L-01 means the main lights relay is stuck closed. The interior lights stay on even with the door shut, because the relay keeps feeding them power. Lights left on add heat inside the cabinet, which can make the refrigerator work a little harder. Beyond the code, you might see light leaking around the door edge or feel the light housing warmer than normal.

Common causes of 15-L-01

  • Relay contacts on the board stuck together
  • A board output stuck on
  • Lighting circuit wiring holding power
✓ One safe check you can try

1. Close the door in a dark kitchen and look along the edges for light leaking out. 2. Check that the door switch is not stuck in. 3. Reset the breaker once. 4. If the lights stay on with 15-L-01 showing, call us.

! Why to stop there
  • Constant light adds heat inside the cabinet
  • Relay testing is done on a live board
  • A board replacement needs correct programming
Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.
→Same appliance

Other Refrigerator codes

15-L-0115-L-01 questions
Why are my refrigerator lights on with the door closed?

The lighting relay is stuck closed, so the board cannot switch them off. That adds a little heat inside, which is why we suggest a repair soon.

Can this affect cooling?

Only slightly. Lights left on warm the cabinet, so the unit runs longer. Food is not usually at risk, but energy use goes up while the lamps stay lit.

Will you check the lamps too?

Yes. Long periods of constant use can wear lamps, so we check them after the relay repair. You get a written price before any work.

Book a visit

Still unsure about 15-L-01?

A technician diagnoses it on site and gives you the price in writing before any work starts.

☎ Call the desk ▤ Book a Repair