Sub-Zero error code · 15 9 01
Sub-Zero Code 15 9 01: Dispenser Auger Relay Stuck Closed
Sub-Zero code 15 9 01 means the dispenser auger relay is stuck closed, powering the auger at all times. The fix is verifying and replacing the control board.
Sub-Zero code 15 9 01 means the dispenser auger relay on the control board is stuck closed, so the auger motor receives power at all times instead of only when ice is requested. Because the relay is part of the control board, the fix is to verify the fault and replace the control board.
15 9 01, explained
The control board powers the dispenser auger motor through a relay when ice is dispensed. Code 15 9 01 is set when the board detects that relay stuck closed, meaning the auger is energized continuously. On built-in units this relay is integral to the control board, so the board reports the stuck-closed condition and turns on the SERVICE light.
Severity:Service recommended · Service light:ON
Which part 15 9 01 points to
- Control board — Primary repair; the stuck-closed auger relay is integral to the board and corrected by board replacement after verification
- Dispenser auger motor — Inspected only if found drawing abnormal current that may have welded the relay
Why 15 9 01 appears
Relay contacts weld closed after years of switching the high-current auger motor, from a voltage surge, or from excess current overheating and fusing the points. Continuous motor load and heat at the contacts accelerate the wear. Once welded, the relay cannot open and the auger runs whenever the board is powered.
How 15 9 01 shows up
- Auger motor running continuously, even with the dispenser not pressed
- Ice being pushed out or churned without a dispense request
- Auger motor noise that does not stop
- SERVICE light illuminated
- Code 15 9 01 stored in diagnostics
What usually causes it
- Welded or fused auger relay contacts on the control board
- Voltage surge or spike damaging the relay
- High auger motor current overheating the contacts over time
- Repeated switching wearing the contact surfaces
- Age-related control board degradation
What you can safely check
- Note the code and whether the auger runs without being requested
- Power the unit off at the breaker to stop continuous auger operation until service
- Confirm the dispenser keys are not stuck or held down
- Do not open the control housing or attempt to test the relay
When 15 9 01 needs a technician
A stuck-closed auger relay keeps the auger motor energized continuously and is on the control board, so it is corrected by verifying the fault and replacing the board, work for a technician.
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Frequently asked
Sub-Zero 15 9 01 — questions
What does Sub-Zero code 15 9 01 mean?
Code 15 9 01 means the dispenser auger relay on the control board has stuck closed, so the auger motor is powered continuously instead of only when ice is requested. The board detects the welded contacts, logs 15 9 01, and turns on the SERVICE light. In practice the auger motor runs and churns ice nonstop even when no one is pressing the dispenser.
Can I fix code 15 9 01 myself?
No. The stuck-closed auger relay is integral to the control board, and the repair is to verify the fault and replace the board, which is technician work. The safe owner step is to power the unit off at the breaker to stop the auger from running continuously, and to confirm the dispenser keys are not stuck or being held down before service.
How do I clear code 15 9 01?
A breaker power-cycle for a couple of minutes lets you check whether the auger stops, but a welded relay keeps the motor energized and 15 9 01 returns with the SERVICE light. This code is not cleared by resetting, the fused contacts must be replaced by changing the control board. Repeated resets only leave the auger churning ice in the meantime.
Is it safe to keep using the unit with code 15 9 01?
Cooling is unaffected, so this is medium severity, but the auger motor running continuously is hard on the dispenser and wastes and churns the ice in the bin. The recommended interim step is to power the unit off at the breaker to stop the continuous auger operation until a technician can replace the board.
Which part is at fault in 15 9 01 and what does it cost?
The failed component is the dispenser auger relay, which is part of the control board, so the board is the primary repair after verification. The auger motor is inspected only if it was drawing abnormal current that may have welded the relay. We charge a flat $89 to diagnose, back the repair with a 365-day warranty, and take calls at (650) 668-1554.
How is 15 9 01 different from 15 9 00?
They are opposite states of the same dispenser auger relay. 15 9 01 is stuck closed, so the auger runs continuously without a dispense request and the SERVICE light comes on. 15 9 00 is stuck open, so the auger gets no power and ice will not dispense at all, with no SERVICE light. Identifying it as 15 9 01 tells the technician the auger is running nonstop rather than dead.
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