Le magasin va me rembourser si l'appareil tombe en panne.

French object pronouns usually go before the verb they belong to. Here me is the object of rembourser, so it goes right before the infinitive: va me rembourser.

This same pattern appears in:

• Je vais te rappeler
• Il va nous aider
• On va les remplacer

So me va rembourser is not correct.

Rembourser means to reimburse or to refund. In a shopping context, it usually means giving the customer their money back.

So me rembourser means refund me / reimburse me.

You may also see:

• rembourser un client
• rembourser un achat
• rembourser la somme payée

Aller + infinitive is the very common near future form in French. It often sounds natural and conversational.

So:

• Le magasin va me rembourser = very natural in everyday speech
• Le magasin me remboursera = also correct, a simple future form

Both work. The version with va + infinitive often feels a bit more immediate or conversational.

After si meaning if in a real condition, French normally uses the present tense, not the future.

So the standard pattern is:

• si + present
• main clause in present, future, imperative, or near future

That is exactly what you have here:

• si l'appareil tombe en panne
• le magasin va me rembourser

So si l'appareil tombera en panne is not standard French.

Not really. It is a fixed idiomatic expression.

Literally, tomber means to fall, but tomber en panne means:

• to break down
• to stop working
• to fail

It is commonly used for machines, cars, devices, appliances, and similar things.

Examples:

• Ma voiture est tombée en panne.
• L’ordinateur tombe souvent en panne.

They are close, but not identical:

• tomber en panne = to break down / to stop working
• être en panne = to be broken down / to be out of order

So:

• Si l'appareil tombe en panne focuses on the moment it fails
• Si l'appareil est en panne focuses on its state of not working

In your sentence, tombe en panne suggests the breakdown is the condition that triggers the refund.

Because French uses elision before a vowel sound.

Le becomes l' before a noun starting with a vowel or silent h:

• le appareil → l'appareil
• le hôtel → l'hôtel

Also, appareil is a masculine noun, which is why the full article would be le.

Appareil is a fairly general word. Depending on context, it can mean:

• device
• appliance
• machine
• unit
• sometimes equipment

French often uses appareil where English might choose a more specific word. The exact meaning depends on what product is being discussed.

Because en panne is a fixed expression. You learn it as a chunk: être en panne or tomber en panne.

French has many expressions of this kind with en:

• en retard
• en colère
• en danger
• en panne

So you do not say en la panne or en une panne here.

Yes, but French often uses a business or institution as the subject, just as English does.

So Le magasin va me rembourser means the store/company is responsible for the refund. It does not mean the building itself is literally acting.

You could also say things like:

• Le vendeur va me rembourser
• Le service client va me rembourser
• On va me rembourser au magasin

But Le magasin is completely natural.

No. French does not use a stressed pronoun like moi directly as the normal object after the verb in this kind of sentence.

You need the object pronoun me:

• Le magasin va me rembourser

Moi is used for emphasis or after a preposition:

• Moi, je ne suis pas d’accord.
• Le magasin rembourse mon frère, pas moi.
• avec moi

So in your sentence, me is the correct form.