Sub-Zero error code · 15 8 00
Sub-Zero Error Code 15 8 00: Icemaker Relay Stuck Open
Sub-Zero code 15 8 00 means the icemaker relay is stuck open, so no power reaches the icemaker. Causes, owner checks, and when a technician is needed.
Sub-Zero code 15 8 00 on a Built-In (BI) unit means the icemaker relay is stuck open, so the control board cannot power the icemaker. The most common symptom is no ice production while the rest of the refrigerator continues to cool normally. Sub-Zero's guidance is to verify the fault and, if confirmed, replace the control board, since the relay is part of that board.
This fault does not affect food safety, so it is lower urgency than the compressor relay codes, but it does require technician-level diagnosis and typically a control-board replacement to restore ice production.
What 15 8 00 means
A relay on the control board switches power to the icemaker module. "Stuck open" means the contacts are not closing, so the icemaker receives no power and cannot run a harvest cycle. The recommended action is to verify the condition and replace the control board if confirmed, because the relay is integrated and not separately serviceable. Verification should rule out the icemaker module and its wiring before condemning the board.
Severity:Minor
Common causes
- Failed icemaker relay on the control board (contacts not closing)
- Control board degradation from age, heat, or a power surge
- Corrosion or solder-joint failure on the relay circuit
- Wiring or connector fault between the board and the icemaker
- Icemaker module fault contributing to the no-power condition (must be verified)
What you can check yourself
- Confirm the icemaker is switched on and not in a paused or off state at the control panel.
- Verify the water supply is on so ice failure is not mistaken for a water issue.
- Power cycle the unit at the breaker for about 5 minutes, then restore power.
- Check that the ice bin is seated correctly and not blocking the icemaker.
When to book a pro
Confirming a stuck-open icemaker relay requires checking for board-controlled power at the icemaker and verifying the icemaker module and wiring first. This involves live electrical measurement at the control board and is technician work. The usual corrective action is a control-board replacement after the relay fault is verified.
Have this code?
Send us the code and your model — flat $89 diagnostic, 365-day warranty.
Book a technicianHow to enter service mode →All Sub-Zero error codesAll brands
Frequently asked
15 8 00 FAQ
What does Sub-Zero error code 15 8 00 mean?
A relay on the control board switches power to the icemaker module. "Stuck open" means the contacts are not closing, so the icemaker receives no power and cannot run a harvest cycle. The recommended action is to verify the condition and replace the control board if confirmed, because the relay is integrated and not separately serviceable. Verification should rule out the icemaker module and its wiring before condemning the board.
Can I fix Sub-Zero 15 8 00 myself?
You can safely try: Confirm the icemaker is switched on and not in a paused or off state at the control panel.; Verify the water supply is on so ice failure is not mistaken for a water issue.; Power cycle the unit at the breaker for about 5 minutes, then restore power.; Check that the ice bin is seated correctly and not blocking the icemaker.. Confirming a stuck-open icemaker relay requires checking for board-controlled power at the icemaker and verifying the icemaker module and wiring first. This involves live electrical measurement at the control board and is technician work. The usual corrective action is a control-board replacement after the relay fault is verified.
How urgent is Sub-Zero 15 8 00?
15 8 00 is minor. Low urgency. It is typically a lockout or minor alert you can clear yourself; only book service if it keeps returning.
How do I clear or reset Sub-Zero 15 8 00?
Some Sub-Zero codes clear once the cause is fixed or after a one-minute power cycle at the breaker; others stay until repaired. If 15 8 00 returns after a reset, the fault is still present — see how to reset a Sub-Zero control panel, or book a technician.
Which part does Sub-Zero 15 8 00 usually involve?
Confirming a stuck-open icemaker relay requires checking for board-controlled power at the icemaker and verifying the icemaker module and wiring first. This involves live electrical measurement at the control board and is technician work. The usual corrective action is a control-board replacement after the relay fault is verified.
What does it cost to fix Sub-Zero 15 8 00?
The diagnostic/service call is a flat $89, and every repair is backed by a 365-day warranty on parts and labor. You get a clear quote before any work — call (650) 668-1554 or book online.
Subzero Repair · Open 24/7 · 365-day warranty
Need a high-end appliance repaired?
Call for urgent cooling or cooking failures, or book online for a service window across the Bay Area.