Sub-Zero 40 8 40: the ice maker filled for the full time and still came up short
On Classic (BI) built-in models, 40 8 40 means the ice maker filled for its maximum time without reaching the volume it needs.
Mon–Sat, 8am–8pm
- Water supply and fill
- Ice maker water inlet valve repair
- Source: Sub-Zero
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What 40 8 40
actually means.
On Classic (BI) built-in models, 40 8 40 means the ice maker filled for its maximum time without reaching the volume it needs. Low pressure, a clogged filter or a partly frozen fill tube can all slow the water reaching the mold, which leaves small or hollow cubes or none at all.
Sub-Zero ice maker display · also shown as 40-8-40, 40840
What to do when 40 8 40 shows on the ice makerKind of codeWater supply and fill
The ice maker asked for water and got too little, too slowly or none at all, or water kept arriving after the fill should have ended. A closed shutoff, a kinked line, a clogged filter and low house pressure are ruled out before the water inlet valve is replaced or the fill tube is thawed. If water is on the floor, close the supply valve before reading anything on the display.
Usually leads toIce maker water inlet valve repair
The electric valve that lets water into the ice maker, tested and replaced when it will not open, opens only partway, or keeps dripping after it should have closed.
Shows up asIce Maker Making Small or Hollow Cubes
The ice maker making small cubes, thin crescents, hollow shells with water inside or fragments that break apart in the bin tells you the mold is not getting a full fill.
MakeSub-Zero
Sub-Zero ice maker service, for ice makers in built-in units and those under the counter.
SourceSub-Zero answer: Classic built-in error code 40 8 40
Sub-Zero Classic (BI) built-in models with an ice maker and flow sensing.
Before you book,
in this order.
Each step comes from Sub-Zero's own guidance for 40 8 40 on its ice makers. Follow it to the end: the last card says whether this is a visit.
Make sure the water shutoff to the unit is fully open and the supply line has no kinks.
Replace the water filter if it is due, then switch the unit's home breaker off for 30 seconds and back on.
Book a visit if 40 8 40 returns, especially if cubes stay small.
Still there?
It usually turns into ice maker water inlet valve repair. Book with the code and the model number.
What not to do
40 8 40 does not mean water is overflowing. It is the reverse: too little water arrived in the time allowed.
What you may
notice with it.
The ice maker problems 40 8 40 tends to arrive with. Answer these at the ice maker before anyone is booked.
All problems
Where 40 8 40 usually leads
Ice maker water inlet valve repair.
Sub-Zero
ice makers.
Sub-Zero ice maker service, for ice makers in built-in units and those under the counter.
Sub-Zero ice maker repairMore Sub-Zero codes
All 15 Sub-Zero codesWater supply and fill on other makes
Door ice maker
The ice maker that feeds the dispenser on the outside of a door: tucked into an insulated box in the left door of a French door model, or at the top of the freezer side of a side-by-side, with a chute and an auger carrying cubes to your glass.
Freezer ice maker
The ice maker that sits inside the freezer compartment itself, a tray that twists or a mold with a heater and an ejector, dropping cubes into a bin or drawer you open by hand, with no dispenser on the door.
Undercounter ice maker
A built-in residential ice maker that lives under a kitchen, bar or basement counter, making clear cubes or chewable nugget ice on its own cooling system, with a water line in and a gravity drain or a small drain pump out.
In Sub-Zero's own words
Ice maker ran for maximum fill time without achieving necessary volume
Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Sub-Zero Classic (BI) built-in models with an ice maker and flow sensing.
Sub-Zero 40 8 40 ice maker repair,
where we come out.
The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered.
All service areasTampa BayFL · 31 areas
Miami / South FloridaFL · 47 areas
New York MetroNY · 75 areas
HoustonTX · 36 areas
ChicagoIL · 50 areas
Los AngelesCA · 95 areas
San DiegoCA · 31 areas
Questions
about 40 8 40.
Can I clear 40 8 40 myself?
Why are my Sub-Zero cubes small after 40 8 40?
Can a frozen fill tube cause 40 8 40 on a Sub-Zero?
Does a new water filter fix 40 8 40 on a Sub-Zero?
Back to your everyday
Still showing 40 8 40?
Book with the code or the blink pattern written exactly as the ice maker shows it, the full model number, and whether there is any water on the floor — when there is a code, that is where the diagnosis starts.