This is a latent problem.
Latent problems lie undetected until they manifest themselves in a failure.
More widely, anything can be described at latent if it is present but undetected.
For example a disease could have latent symptoms - you don't know that you have the disease.
ell.stackexchange.com/users/4376/Chenmunka
I think there are more basic answers with the connotations the asker is going for.
Such a thing is "taken for granted" (phrase used in Kat's comment) or treated as a "given".
If you are responsible for providing it, you have a "thankless job" -- you do essential work in the background and will get more attention for the one time it goes wrong than the thousand times you do the job
right.
When something has always worked to the point that a breakdown is inconceivable and yet happens, that is a "black swan".
ell.stackexchange.com/users/57779/nanoman
I think I know the kind of thing you are talking about.
For instance, in film production, things like focus and keeping the microphone out of the scene are only noticeable if they go wrong.
When you drive, you only really think about your brakes if they don't do as you expect.
But, if that's what you mean, then I don't think there is a word in English for it.
The concept comes up often enough that variations on the description "
that's the sort of thing that you only notice when it doesn't work"
is one I've come across a number of times.
So, if there is such a word, I don't think very many people know it.
ell.stackexchange.com/users/19148/Mark Foskey
To borrow a term from organizational theory: hygiene factor A hygiene factor is a something that does not generally contribute to satisfaction when present, but causes dissatisfaction when absent.
Having good hygiene doesn't make a person more likable, but having bad hygiene would make others have a negative opinion of the person.
ell.stackexchange.com/users/57763/C.J. Jackson
If you can use a twist on an idiom, I think an un squeaky (or quiet ) wheel would work well for this.
The traditional saying is The squeaky wheel gets the grease/oil meaning that the most noticeable problem (or complainer) will be tended to first.
(See, for example, Wikipedia's page on the saying or Cambridge Dictionary 's definition.)
Following this meaning, a wheel which doesn't squeak (isn't causing a problem) is not going to attract attention.
A couple of examples of the phrase used this way:
[T]here is a strong tendency [for decision makers to focus on] the steps that are known from the outset to be fraught with danger, the "squeaky wheels.
" Consequently, they tend to overlook the more subtle or hidden risks in any relatively nondangerous or routine step in the plan.
This is what I refer to as "the unsqueaky wheel trap." —
Irving Lester Janis, article in Information Systems:
Failure Analysis , John Wise & Antony Debons, ed., 2012
I suspected the Unsqueaky Wheel hadn't gotten enough oil.
Being undemanding in a hectic home, she was easily overlooked — Judith Ruskay Rabinor, A Starving Madness: Tales of Hunger, Hope, and Healing in Psychotherapy , 2013
ell.stackexchange.com/users/37569/1006a
You question specifically asks for a term that stands for two failures, one of which remains hidden until the other's failure.
There are a few terms from specific disciplines that do this.
In genetics , its an "unexpressed" or "suppressed" gene.
The unexpressed gene lacks an unlocking enzyme not normally present, while the suppressed gene stays turned off in the absence of a normally occurring blocking enzyme.
When a genetic error elsewhere makes the unlocking enzyme or fails to make the blocking enzyme, we get an abnormality.
In espionage , its called a "sleeper cell.
"
In software , its called a "Time Bomb" or "Logic Bomb" virus, if deliberately placed, or a "conditional capture" if its an undetected mistake not found during normal program operations.
In statistics , its sample "covariance", which drastically reduces the true power of multi-variable correlations.
In systems diagnostics, its a "cascading failure".
I like "latent" as the expression of an inherent, perhaps unknown, failure mode; but, it doesn't automatically imply that something abnormal must occur before it comes to light.
Any of the discipline specific terms up indicate the dual, dependent nature of the failures.
Good hunting.
ell.stackexchange.com/users/57773/Ron Gordon
The closest I can come to this meaning is "oversight", which actually has several meanings: oversight (noun): watchful and responsible care, regulatory supervision an inadvertent omission or error.
Example: The company claimed the accounting error was simple oversight , but the prosecutor countered that it actually counted as criminal negligence.
Because none of the committee was directly responsible for managing the investigation, its failure was due more to oversight than incompetence.
ell.stackexchange.com/users/42184/Andrew
In a software context especially, you could use: Background task - something process that runs unattended; Deamon - a task running in the background, without graphical elements.
ell.stackexchange.com/users/37329/someonewithpc
I've called the types of devices which are noticeable only when they fail as "spleens".
The spleen is an organ found in mammals and reptiles whose operation is completely unnoticeable so long as it is healthy, few people even know its function even if they know its name.
However, damaged or diseased spleens are very painful and very dangerous.
This is not a well-known usage of the word
but I've found that people understand it easily.
ell.stackexchange.com/users/9809/dotancohen
I'm looking for a word that would describe a phenomenon of noticing things only when they go wrong. "A thing that's only noticeable when it goes wrong is ... "
Word for something that is only noticeable when it goes wrong?
ell.stackexchange.com
<word-request>
ell.stackexchange.com/questions/134338
ell.stackexchange.com/users/49847/Alexey Nekrashevich
This is known as a latent problem. This is a problem that is latent.
This is a problem that is latent.
Latent problems lie undetected until a failure occurs.
More generally, if present, but undetected, nothing can be described latent.
For example, you do not know that a disease can have latent symptoms.