Sub-Zero Designer Wine (IW) Code 15-3-00: zone 3 compressor relay stuck open

What 15-3-00 means

For Sub-Zero Designer Wine Storage IW units like the IW-30R, 15-3-00 means the zone 3 compressor relay is stuck open. Zone 3 asks for cooling, the board tries to switch the compressor on, but the relay contacts never meet. Nothing runs for that zone, so it slowly warms. The code reads 15 3 00 on the panel while the remaining zones behave normally.

Common causes of 15-3-00

A zone 3 relay whose contacts do not close
A board output that never energizes the zone 3 relay
An open connection between the relay and its compressor

✓ One safe check you can try

1. Check how warm zone 3 has become. 2. Relocate bottles you care about most to a working zone. 3. Reset power once at the breaker and give the unit time to restart. 4. Reach out to us if 15-3-00 is still there. 5. Keep the door closed between checks so zone 3 loses cold slowly.

! Why to stop there

Measuring the relay requires live voltage tests on the board
Covers inside the unit protect wiring that owners should not handle
A missed wiring issue can cause the same code after a new relay

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 Wine Storage codes

90-H-82Sub-Zero Designer Wine (IW) Code 90-H-82: partial communication with the CCM 90-H-83Sub-Zero Designer Wine (IW) Code 90-H-83: bad data from the high voltage micro 90-H-84Sub-Zero Designer Wine (IW) Code 90-H-84: high voltage micro failed to initialize 95-1-00Sub-Zero Designer Wine (IW) Code 95-1-00: zone 1 door open too long EC 11Sub-Zero 400 Series Wine Code EC 11: upper cabinet too cold EC 13Sub-Zero 400 Series Wine Code EC 13: lower cabinet cold alarm EC 15Sub-Zero 400 Series Wine Code EC 15: unit not cooling Service flashingSub-Zero 400 Series Wine "Service" Flashing: compressor ran too long

15-3-0015-3-00 questions

Why is zone 3 getting warm when the others are fine?

The zone 3 relay is not closing, so its compressor never starts. The other zones have their own relays, which is why they keep cooling normally.

Is 15-3-00 related to 15-3-01?

Both describe the zone 3 compressor relay. 15-3-00 means it will not close, so no cooling; 15-3-01 means it will not open, so cooling never stops.

Can you repair it in one visit?

Often, if the relay or board is on hand. We test first, give you a written price, and stand behind the work with a 30-day warranty.