Sub-Zero error code · 15 2 00
Sub-Zero Error Code 15 2 00: Freezer Compressor Relay Stuck Open
Sub-Zero code 15 2 00 means the freezer compressor relay is stuck open, cutting power to the compressor. Causes, owner checks, and when a pro is needed.
Sub-Zero code 15 2 00 on a Built-In (BI) unit means the freezer compressor relay is stuck open, so the control board cannot send power to the compressor that serves the freezer. The likely symptom is a warming freezer and thawing contents. Sub-Zero's guidance is to verify the fault and, if confirmed, replace the control board, since the relay is part of that board.
Because this affects the freezer's ability to hold temperature, treat it as time-sensitive for frozen food. The repair itself involves high-voltage diagnosis and a control-board replacement, which is technician work.
15 2 00, explained
On dual-compressor Built-In models, a dedicated relay on the control board switches power to the freezer compressor. "Stuck open" means those contacts are not closing, so the compressor gets no power and cannot run. The recommended action is to verify the condition and replace the control board if the relay is confirmed faulty, because the relay is integrated and not independently serviceable. Verification must rule out the compressor and its wiring as the cause.
Severity:Service needed
What usually causes it
- Failed freezer compressor relay on the control board
- Control board degradation from age, heat, or a power surge
- Corroded contacts or a failed solder joint on the relay circuit
- Wiring or connector fault between the board and the freezer compressor
- Compressor start components contributing to the no-start (must be verified separately)
What you can safely check
- Verify the unit is powered and the household breaker has not tripped.
- Power cycle at the breaker for about 5 minutes, then restore power and observe whether the freezer begins cooling.
- Keep the freezer door closed and minimize openings to preserve frozen food while you arrange service.
- Note whether the freezer compressor attempts to start and relay any clicking sounds to the technician.
When 15 2 00 needs a technician
Confirming a stuck-open freezer relay requires checking for board-controlled power at the compressor and verifying the compressor and start components before replacing the board. These are live high-voltage checks inside the unit and require a qualified technician. The usual fix is a control-board replacement, performed only after the relay fault is verified.
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Frequently asked
Sub-Zero 15 2 00 — questions
What does Sub-Zero error code 15 2 00 mean?
On dual-compressor Built-In models, a dedicated relay on the control board switches power to the freezer compressor. "Stuck open" means those contacts are not closing, so the compressor gets no power and cannot run. The recommended action is to verify the condition and replace the control board if the relay is confirmed faulty, because the relay is integrated and not independently serviceable. Verification must rule out the compressor and its wiring as the cause.
Can I fix Sub-Zero 15 2 00 myself?
You can safely try: Verify the unit is powered and the household breaker has not tripped.; Power cycle at the breaker for about 5 minutes, then restore power and observe whether the freezer begins cooling.; Keep the freezer door closed and minimize openings to preserve frozen food while you arrange service.; Note whether the freezer compressor attempts to start and relay any clicking sounds to the technician.. Confirming a stuck-open freezer relay requires checking for board-controlled power at the compressor and verifying the compressor and start components before replacing the board. These are live high-voltage checks inside the unit and require a qualified technician. The usual fix is a control-board replacement, performed only after the relay fault is verified.
How urgent is Sub-Zero 15 2 00?
15 2 00 is service needed. High urgency. Book a technician promptly — leaving this unresolved risks loss of cooling or further damage.
How do I clear or reset Sub-Zero 15 2 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 2 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 2 00 usually involve?
Confirming a stuck-open freezer relay requires checking for board-controlled power at the compressor and verifying the compressor and start components before replacing the board. These are live high-voltage checks inside the unit and require a qualified technician. The usual fix is a control-board replacement, performed only after the relay fault is verified.
What does it cost to fix Sub-Zero 15 2 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.
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