Sub-Zero error code · 30 8 05
Sub-Zero Code 30 8 05: No Fill Signal From Icemaker
Sub-Zero code 30 8 05 means the board got no fill signal from the icemaker. Usually icemaker power/wiring or a failed icemaker module.
Sub-Zero code 30 8 05 means the control board never received a fill request signal from the icemaker module when it expected one. The fix is to verify power and wiring to the icemaker, and replace the icemaker module if it is not signaling.
What 30 8 05 means
The icemaker module normally signals the control board when it is ready for a water fill. This code is logged when that signal is absent, so the board cannot initiate a fill. The result is that the harvest-and-fill cycle stalls and no fresh ice is made.
Severity:Service recommended
Common causes
- Loss of power or ground to the icemaker module
- Loose or corroded icemaker connector
- Damaged wire in the icemaker harness
- Failed icemaker control module
- Moisture or frost intrusion at the module contacts
Why 30 8 05 happens
The icemaker module loses its supply or ground through a corroded plug or chafed harness, or the module's internal control fails so it never requests fill. Connectors at the icemaker can loosen from vibration, and moisture intrusion around the module corrodes contacts over time.
What you'll typically see
- Icemaker stops producing ice while the rest of the unit runs normally
- Ice bin slowly empties and is not refilled
- No water fill heard at the normal interval
- Code stored in diagnostics with no SERVICE light
- Icemaker appears powered but never cycles
Parts involved in 30 8 05
- Icemaker module/assembly — Replace when power and wiring are good but the module sends no fill signal
- Icemaker harness/connector — Repair or replace if the signal loss is due to wiring rather than the module
What you can check yourself
- Confirm the icemaker switch is on
- Make sure the household water supply valve is open
- Power-cycle the refrigerator and watch for an ice cycle
- Record the code and how long ice has been absent
When to book a pro
Distinguishing a wiring or power loss from a failed icemaker module requires measuring voltage and ground at the module connector under live conditions. A technician confirms the source before replacing the module.
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
30 8 05 FAQ
What does Sub-Zero code 30 8 05 mean?
Code 30 8 05 means the control board never received a fill request signal from the icemaker module when it expected one. The module normally tells the board it is ready for a water fill; when that signal is absent the board cannot start a fill, so the harvest-and-fill cycle stalls and no fresh ice is made.
Are there owner checks I can try before calling about 30 8 05?
Yes. Make sure the icemaker switch is actually on, confirm the household water supply valve feeding the refrigerator is fully open, then power-cycle the unit and watch whether an ice cycle begins. Also note how long ice has been absent. If the module still sends no fill signal after those steps, the cause is electrical and needs a technician.
How do I reset code 30 8 05?
Power the refrigerator off at the breaker for about a minute, which clears the stored 30 8 05 and lets the icemaker re-attempt a cycle. If the loss of signal was a momentary glitch it may resume, but if power, ground, or the module is genuinely at fault the code returns because the module still will not request a fill until the underlying connection or module is repaired.
Is it safe to keep using the refrigerator with code 30 8 05?
Yes, it is low urgency. The refrigerator and freezer keep cooling normally; only the icemaker is affected, so the bin slowly empties and is not refilled. There is no safety concern, so you can keep using the unit and simply schedule service to restore ice production at your convenience.
What part fixes 30 8 05 and what is the cost?
If power and wiring to the icemaker test good but the module still sends no fill signal, the icemaker module or assembly is replaced; if the loss is a corroded connector or chafed harness, the wiring is repaired instead. We measure voltage and ground live at the connector on a flat $89 diagnostic before replacing anything, and the repair carries a 365-day warranty. Call (650) 668-1554.
How is 30 8 05 different from an icemaker open-circuit code like 30 8 10?
Code 30 8 05 is about a missing fill-request signal from the module, the wiring and module may have continuity but the module never asks for water. Code 30 8 10 is a genuine open circuit where the board sees no electrical load at all. That distinction matters because 30 8 05 often points to power, ground, or the module's internal logic, which a technician confirms by metering voltage and ground at the module connector under live conditions.
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.