A rotary screw compressor is a 15-year industrial machine. The brand on the cabinet matters less than who is going to keep it running for those 15 years. This page is the screw-specific deep dive on warranty, service contracts, and downtime planning.

For the broader argument on why local service is more important than the brand you pick, see why local service matters more than the brand you pick. That page is type-agnostic and applies to any industrial compressor. The current page focuses on the specifics that matter for screws: airend warranty, drive warranty, oil requirements, manufacturer-direct vs dealer service models, and how to plan for the day your screw breaks.

Why service and support is half the buying decision

A screw compressor has a few proprietary, expensive, and failure-prone components: the airend (the rotating screw element), the drive electronics on VSD units, the controller, and the oil management system. When any of these fail, you cannot fix them with generic parts from a hardware store. You need:

  • The right replacement part (proprietary, brand-specific, often only available through the manufacturer's network)
  • A technician who knows the machine (training, diagnostic tools, software access)
  • The diagnostic software for the controller (every major brand has its own)

This means the service relationship is locked in for the life of the machine. You cannot easily switch service providers the way you can with simpler equipment. The local service company you have at purchase is the company you are committing to, in practice, for 15 years.

For a screw that will run 6,000-8,000 hours per year for 15 years, the lifetime service and parts cost typically equals or exceeds the original purchase price. The brand decision is really a brand-plus-service-network decision.

Manufacturer-direct support vs dealer-only

There are two basic service models in industrial compressed air, and they have very different implications for your service relationship.

The Atlas Copco model in Europe (and why it matters)

In most European countries, Atlas Copco runs factory-direct service. The technicians who show up at your plant are Atlas Copco employees, trained at the factory, with access to factory parts inventory and factory diagnostic software. There is one phone number for service, one accountability chain, and the service quality is consistent across the country.

Kaeser operates a similar factory-service model in many of its core markets. So does Sullair in some regions under Hitachi.

The advantages of the factory-direct model:

  • Consistency. The service tech in city A is trained the same way as the tech in city B. Same procedures, same parts inventory, same diagnostic tools.
  • Single accountability. If something goes wrong, there is no finger-pointing between dealer and manufacturer.
  • Long-term continuity. The service company is the manufacturer, which is not going to suddenly go out of business or lose the brand contract.
  • Better parts availability for the long tail of older machines, because the factory keeps parts for legacy models that an independent dealer would have stopped stocking.

In the US, Atlas Copco operates more through subsidiaries and authorized dealers, so the experience varies more by region. Still better than a pure dealer-only model, but not as consistent as the European factory-direct setup.

What "dealer-only" really means when things go wrong

Many brands operate through independent authorized dealers as their only service channel. The dealer holds the brand relationship, sells the machines, and provides all service. The manufacturer rarely has direct contact with the end customer.

When everything is working, this can be fine. When things go wrong, dealer-only service can be a problem because:

  • The dealer is your only path to the manufacturer. If your local dealer is incompetent or slow, you cannot escalate around them easily.
  • Dealer continuity is real. Dealers go out of business. Dealers lose the brand contract and have to hand over their customers to a new dealer who has to start from scratch. Dealers get acquired and change priorities. For a 15-year machine, the dealer who sold you the unit may not be the dealer servicing you in year 10.
  • Parts inventory varies wildly. A dealer who covers a large region with a small parts stock will routinely have to ship parts in from the manufacturer, which adds days to every repair.
  • Training varies. Factory-trained means different things at different dealers. Some send their techs to factory training every year; others train internally and the gap shows up when something complex fails.

When evaluating a dealer-only brand, ask:

  • How long has this dealer held the brand relationship? (A new dealer often has green technicians.)
  • How many of the same brand and size of machine have they installed in your region in the last 5 years?
  • What happens to your service contract if the dealer loses the brand or goes out of business?
  • Is there any path to escalate to the manufacturer directly?

Warranty: what's covered, what isn't, how long

Screw compressor warranties have more fine print than most buyers realize.

Standard warranty terms for major brands in 2026:

  • Overall machine: typically 1-2 years on parts and labor. Some brands offer 3 years as a base.
  • Airend: often a separate, longer warranty (5 years is common, 10 years on some brands as a marketing point). The conditions matter: the airend warranty almost always requires you to use the manufacturer-specified oil, follow the manufacturer's PM schedule, and have all service done by an authorized technician.
  • VSD drive electronics: often SHORTER than the rest of the machine. A 1-year warranty on the drive is common, even when the airend has 5 years. The drive is the most failure-prone expensive component on a VSD machine, so the short warranty matters.
  • Motor: usually covered for the standard 1-2 years, sometimes longer.
  • Controller: standard warranty period, but software-related issues can be excluded.

What voids the warranty (read the fine print carefully):

  • Using non-OEM oil. Many warranties specify the exact oil grade and brand, and using anything else voids the airend warranty entirely. This is the most common reason warranty claims get rejected.
  • Service performed by a non-authorized technician. Some warranties allow your in-house techs to do PM if they are trained and certified; others don't.
  • Modifications to the machine (custom controls, non-standard pre-filters, etc.).
  • Operating outside specified conditions (ambient temperature, humidity, voltage variation).
  • Not following the PM schedule (missing intervals can void claims for parts that would have been caught by inspection).

Practical advice:

  • Read the warranty terms BEFORE you buy. Get them in writing.
  • Ask specifically about the airend warranty terms and what voids it.
  • Ask what an out-of-warranty airend replacement actually costs on this model. For a 75 kW screw, expect €8,000-€15,000 for a new airend. This number should influence which extended warranty options you consider.
  • Ask about the VSD drive warranty separately. It often has different terms from the rest of the machine.

Service contracts: what to ask, what's worth paying for

Service contract types vary, but generally fall into three tiers:

  • Time and materials: you pay per service visit, including travel, labor, and parts. Cheapest if the machine never needs anything. Expensive when it does.
  • Preventive maintenance contract: scheduled PM visits at the manufacturer's recommended intervals (typically 1,000, 2,000, and 8,000 hours), with labor included and parts at a fixed or discounted rate. The standard for most industrial buyers.
  • Full coverage / planned maintenance with parts: PM visits, all parts included, often 24/7 emergency response. The premium option, worth it for production-critical applications.

What is worth paying for:

  • Manufacturer-recommended PM schedule, by factory-trained tech. Almost always worth it. The PM schedule is not arbitrary; it is calibrated to the failure modes of the machine. Skipping intervals to save money usually costs more in unplanned downtime.
  • 24/7 emergency response. Worth it for production-critical sites. Get the response time commitment in writing.
  • Loaner or rental compressor commitment. If your business cannot tolerate an extended outage (more than 2-3 days), the loaner clause is worth more than the line-item cost suggests.

What to ask before signing:

  • Is the PM schedule the manufacturer's recommendation, or an upsold "deluxe" version?
  • Are the parts included in the contract price, or extra at standard pricing?
  • What is the response-time commitment for an emergency call? Get it in writing.
  • What is the loaner / rental availability commitment? Specifically, how fast can a loaner be on site if your unit is down?
  • Can you escalate to the manufacturer if the local service company cannot resolve an issue?

Avoid contracts that auto-renew at increased rates with no review. Insist on an annual review of the actual service performed vs the contract terms.

Downtime planning

Response time when a unit fails

Before you sign anything, decide what your maximum acceptable downtime is. The honest answer drives everything else.

  • A small workshop where the compressor stops a tool but not the whole operation: 24-48 hours is probably acceptable.
  • A continuous production line where the compressor going down stops the whole plant: 4-8 hours maximum, often less.
  • A 24/7 production site with critical air dependence: hours of downtime translate directly into thousands or tens of thousands of euros of lost production per hour.

Match the service contract to this number. Typical response times:

  • Manufacturer-direct factory service in a major industrial region: 4-8 hours
  • Authorized dealer with a local tech: 4-24 hours depending on the dealer and the distance
  • No service contract, time and materials only: best-effort, can be days during busy periods

Distance matters more than people realize. If the nearest tech is 4 hours of drive time from your plant, 4 hours is your minimum response no matter what the contract says.

Backup and rental compressor availability

For production-critical sites, the question is not "what is the response time" but "how do you bridge a 1-week repair if the airend fails".

Options:

  • Permanent onsite backup compressor. The gold standard. A second compressor sized to handle the load (or close to it) means a failure is an inconvenience, not a crisis. For multi-compressor sites, the weekend-rotation pattern naturally provides this redundancy (compressors run alternating weeks, so on any given week one is available as standby).
  • Manufacturer or dealer rental commitment. Written into the service contract. Specifies how fast a rental unit can be on site, what size will be provided, who installs it.
  • Independent compressor rental from a specialist rental company (in larger industrial markets). Useful as a backup to the manufacturer commitment, or for sites without a service contract.

For single-compressor sites with no onsite backup, the rental commitment in the service contract is the most important line. Make it explicit and timed.

What it costs to bridge a longer repair

Real numbers (European, 2026):

  • Compressor rental: €1,500-€4,000 per week for a delivered, installed 75-100 kW rental unit, depending on region and notice
  • Airend replacement labor and parts: €8,000-€15,000 for a 75 kW class machine, plus typically 1-3 weeks of lead time for the new airend if it is not in regional stock
  • Lost production cost: highly site-dependent, often the dominant cost. A production line stopping costs €500-€5,000+ per hour for typical industrial plants, sometimes much more for high-value continuous processes.

The math for a single major event: a 2-week airend replacement on a single-compressor site costs roughly €3,000-€8,000 in rental plus €8,000-€15,000 in airend, plus lost production. The total can easily exceed €30,000-€50,000 for one event.

The math for a backup compressor: amortized over 15 years, often cheaper than the rental and downtime cost of two or three major events. For critical production sites, the second compressor justifies itself.

Where to next