Si el cable vuelve a fallar, pondremos la cazuela en otro fuego y cenaremos más tarde.

After si for a real, possible future condition, Spanish normally uses the present indicative, not the future.

So the usual pattern is:

Si + present, future

That is exactly what you have here:

Si el cable vuelve a fallar, pondremos...

In English, we also do something similar:

If the cable fails again, we’ll...

Not if the cable will fail again.

If you wanted a more hypothetical or less likely idea, Spanish would usually change both verbs:

Si el cable volviera a fallar, pondríamos...
= If the cable were to fail again, we would...

Volver a + infinitive means to do something again.

So:

• volver a fallar = to fail again
• vuelve a fallar = it fails again / it starts failing again

This is a very common structure in Spanish:

• volver a intentar = try again
• volver a empezar = start again
• volver a llamar = call again

You could also say si el cable falla otra vez, which means almost the same thing.
So:

• vuelve a fallar
• falla otra vez

are both natural.

Here, fallar means something like to fail, to stop working properly, or to malfunction.

With a thing like el cable, it suggests the cable is unreliable or not working as it should.

Fallar is a useful verb because it can be used in several ways:

• La máquina falla. = The machine is malfunctioning.
• El motor falla. = The engine is acting up.
• No me falles. = Don’t let me down.

In this sentence, the technical meaning is the most likely one.

Spanish often uses the definite article very naturally when the thing is already understood from the context.

So el cable simply means the cable — the cable both speakers already know about.

A possessive like nuestro cable is possible, but it would sound more marked and would only be used if you really wanted to stress ownership or contrast it with another cable.

In everyday Spanish, el cable is the most natural choice if the cable is already identifiable.

Pondremos is the future tense of poner.

The verb poner is irregular in the future because it uses the stem pondr-:

• pondré
• pondrás
• pondrá
• pondremos
• pondréis
• pondrán

So:

poner → pondr- + future endings

This is similar to other common irregular future stems:

• tener → tendr-
• salir → saldr-
• venir → vendr-
• hacer → har-
• decir → dir-

So pondremos means we will put / place.

Because Spanish usually leaves out subject pronouns when the verb ending already makes the subject clear.

Both forms clearly mean we:

• pondremos = we will put
• cenaremos = we will have dinner

So nosotros is not needed.

You could say nosotros pondremos..., but that would usually add emphasis, contrast, or clarity:

• Nosotros pondremos la cazuela, y ellos traerán los platos.

Without that special reason, leaving the pronoun out is more natural.

Not exactly in the usual English sense of a casserole as a specific baked dish.

In Spain, cazuela often refers to a cooking pot, earthenware dish, pan, or casserole dish, depending on the context.

In this sentence, because it is being moved to otro fuego, it most likely means the pot/pan/dish with the food in it.

So in natural English, depending on context, you might think of it as:

• the pot
• the pan
• the casserole dish

The exact object depends on what kind of cooking vessel is being used.

Literally, fuego means fire, but in kitchen contexts in Spain it can refer to a burner or heat source on the stove.

So poner la cazuela en otro fuego means something like:

• put the pot on another burner
• move it to a different ring
• put it over another heat source

As for en, Spanish normally uses poner algo en to mean put something in/on a place:

• poner el libro en la mesa
• poner la comida en el horno
• poner la cazuela en otro fuego

Even though English often says on another burner, Spanish uses en here very naturally.

Yes. Cenar means to have dinner / to eat the evening meal.

So:

• cenaremos = we will have dinner

That is more specific than comer, which more generally means to eat and in Spain often refers to the main daytime meal depending on context.

Some useful meal verbs in Spain are:

• desayunar = have breakfast
• comer = eat / have lunch or the main meal
• cenar = have dinner

So cenaremos más tarde is specifically we’ll have dinner later.

Más tarde is a fixed and very common adverbial expression meaning later.

So:

• cenaremos más tarde = we’ll have dinner later

No extra preposition is needed.

Other similar time expressions are:

• antes = before / earlier
• después = afterwards / later
• más pronto = sooner
• más tarde = later

So this part is very straightforward: más tarde just functions as an adverb.

Yes, absolutely.

These are both natural:

• Si el cable vuelve a fallar...
• Si el cable falla otra vez...

They mean essentially the same thing.

A small difference in feel:

• volver a fallar sounds slightly more like to fail again
• fallar otra vez sounds slightly more like to fail another time

But in normal conversation, the difference is minimal.

Because the sentence begins with a conditional clause:

Si el cable vuelve a fallar, ...

In Spanish, when that kind of introductory clause comes first, it is normal to separate it from the main clause with a comma.

So the structure is:

If X happens, Y will happen.

The comma helps the reader hear the pause and see the sentence structure clearly.

If the order were reversed, the comma is often not used:

Pondremos la cazuela en otro fuego y cenaremos más tarde si el cable vuelve a fallar.

Yes, in many situations that would also be natural.

For example:

Si el cable vuelve a fallar, ponemos la cazuela en otro fuego y cenamos más tarde.

In everyday Spanish, the present tense is often used to talk about the near future, especially in speech.

But the future forms pondremos and cenaremos are also perfectly natural here and make the consequence sound very clear and explicit.

So both are possible, but the original sentence is a very standard textbook-style future condition:

• si + present
• future in the main clause