Sub-Zero error code · 15 8 10
Sub-Zero Code 15 8 10: Ice Accessories Relay Stuck Open
Sub-Zero code 15 8 10 means the ice accessories relay is stuck open, so the fill tube and mullion heaters get no power.
Sub-Zero code 15 8 10 means the ice accessories relay on the control board is stuck open, so there is no power to the ice accessories such as the fill tube heater and mullion heater. Because the relay is part of the control board, the fix is to verify the fault and replace the control board.
What 15 8 10 indicates
The control board energizes the ice accessory heaters, the fill tube heater and mullion heater, through a relay to keep ice from freezing in the fill path. Code 15 8 10 is set when the board detects that relay stuck open, meaning those heaters never receive power. On built-in units the relay is integral to the control board, so the board reports a stuck-open condition.
Likely causes
- Ice accessories relay contacts stuck open on the control board
- Burned or pitted relay contacts from age and switching
- Board-level fault in the relay driver circuit
- Voltage surge damaging the relay
- General age-related control board degradation
What causes 15 8 10
Relay contacts stick open when they fail to make contact due to internal mechanical failure, burned or pitted points from years of switching, or a board fault driving the relay coil. Heat and electrical aging degrade the contacts until they no longer close. A voltage event can also damage the relay or its driver circuit.
Symptoms you may notice
- Ice freezing in or jamming the fill tube
- Frost or ice buildup at the mullion between compartments
- Icemaker producing misshapen cubes or failing to release ice cleanly
- Fill tube heater and mullion heater never warming
- Code 15 8 10 stored with no SERVICE light
Parts typically replaced for 15 8 10
- Control board — Primary repair; the stuck-open ice accessories relay is integral to the board and corrected by board replacement after verification
- Fill tube heater or mullion heater — Inspected only if a heater is also found open after the relay issue is corrected
Owner-safe checks for 15 8 10
- Note the code and any ice jamming in the fill tube
- Power-cycle the unit at the breaker for two minutes and watch for the code
- Avoid forcing or chipping at ice in the fill path
- Do not open the control housing or attempt heater testing yourself
When to call a technician
A stuck-open ice accessories relay is on the control board and is corrected by verifying the fault and replacing the board, requiring diagnostic confirmation and board service by a technician.
Frequently asked
Sub-Zero 15 8 10: people also ask
What does Sub-Zero code 15 8 10 mean?
Code 15 8 10 means the ice accessories relay on the control board has stuck open, so the fill tube heater and mullion heater never receive power. Those heaters normally keep ice from freezing in the fill path and frost from building at the mullion, so with the relay stuck open you get ice jamming the fill tube and frost between compartments. The board logs 15 8 10 with no SERVICE light.
Can I fix the 15 8 10 fault myself?
No. The stuck-open ice accessories relay is part of the control board, and the repair means verifying the fault and replacing the board, which is technician work. As the owner, avoid chipping or forcing at any ice frozen in the fill tube, note where the ice is jamming, and leave the heaters and control housing for the technician to test.
How do I reset code 15 8 10?
Power-cycle at the breaker for about two minutes and watch whether 15 8 10 returns. A relay that is mechanically stuck open will not start closing again from a reset, so the heaters stay unpowered and the code reappears. The durable fix is board replacement after the technician confirms the relay is the cause and the heaters themselves are intact.
Is it safe to keep using the unit with code 15 8 10?
The refrigerator and freezer keep cooling, so it is medium severity, but expect ongoing ice problems: cubes freezing in the fill tube, misshapen ice that will not release cleanly, and frost at the mullion. None of that is a safety hazard, but it will keep getting worse until the relay is corrected, so plan to have it serviced.
Which parts does 15 8 10 involve and what is the cost?
The fault is the ice accessories relay on the control board, so the board is the primary repair after verification. The fill tube heater or mullion heater is inspected only if one is also found open once the relay is corrected. Our diagnostic is a flat $89, repairs come with a 365-day warranty, and you can reach us at (650) 668-1554.
How is 15 8 10 different from 15 8 11?
They are opposite failures of the same ice accessories relay. 15 8 10 is the relay stuck open, so the fill tube and mullion heaters get no power and you see ice jamming and frost. 15 8 11 is the same relay stuck closed, so those heaters run continuously and the icemaker area stays warm, cutting ice output. Knowing it is 15 8 10 tells the technician the heaters are dead, not overheating.
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