Checklist: Verifying Supplier Service Contracts and SLAs

Before signing a service agreement, buyers need to verify exactly what is covered and how fast the supplier will respond. A generator warranty terms document often contains hidden conditions that affect uptime and total cost of ownership. The checklist below groups items by theme to help procurement teams review the contract systematically.

What is covered under the service contract?

The service contract defines the boundaries of support. Read the scope clause carefully. It should list specific items like labor, parts, consumables, and testing. If the contract covers labor but not parts, the buyer pays for every replacement. If it covers parts but not labor, the supplier bills for the visit while the buyer pays for the component.

Review the coverage period. Does it start on delivery or on the first start-up? Some suppliers use the date of installation. This difference can shift the start of the warranty by weeks.

Check if the contract covers the genset as a whole or specific subsystems. A control panel failure might be treated differently from an alternator failure. The agreement should specify which subsystems are included and which are excluded.

Red flags to watch for:

• Vague language like “reasonable efforts” or “standard support.”
• Excluding routine maintenance from the service contract without stating it clearly.
• Separate agreements for control systems and mechanical components.
• Coverage that starts after a trial period rather than at handover.

How are supplier SLA response times defined?

Supplier SLA terms determine how quickly the supplier reacts to a failure. The agreement should state response times in hours, not business days. A 24-hour response window means the supplier acknowledges the issue within one day. A 4-hour response window is stricter and usually costs more.

Define what response means. Does it mean a technician arrives on site, or does it mean a phone call from a support engineer? On-site response is the standard for critical loads. Remote diagnosis may be acceptable for non-critical applications, but the contract must say so.

Specify escalation paths. If the first response misses the window, who is called next? The contract should name a manager or a senior engineer who can authorize priority dispatch. Without a named contact, disputes over missed SLAs become difficult.

Include SLA credits. If the supplier misses a target, what happens? Credits against future service fees are common. Penalties should be specific, not open to negotiation.

Red flags to watch for:

• Response times defined in business days instead of hours.
• No named contact for SLA escalation.
• SLA credits that require a written claim within 24 hours.
• Exclusions for weekends or holidays without stating them.

What are the generator warranty terms and exclusions?

Generator warranty terms are the legal basis for free repair. The warranty should state the duration, typically one year, but some suppliers offer longer periods for specific components. The alternator and engine may have different warranty periods.

Review maintenance conditions. Most warranties require regular service intervals. If the buyer skips a service visit, the warranty may be void. The contract should list the exact intervals and the required documentation. Keep service records from the start.

Check transferability. If the buyer sells the genset, does the warranty transfer? Some supplier warranties are non-transferable. This affects resale value.

Exclusions are often listed in a separate section. Common exclusions include damage from fuel contamination, electrical surges, and improper installation. The contract should define “improper installation” with reference to a standard or a specific procedure. If the definition is missing, disputes become difficult.

Red flags to watch for:

• Warranty void if any service interval is missed, even minor ones.
• Exclusions for “normal wear and tear” without defining what that means.
• Transferability clauses that require supplier approval to transfer.
• Warranty duration that starts after a trial run rather than at delivery.

Are parts supply channels and costs defined?

The service contract should state who supplies parts and at what cost. Some suppliers use only OEM parts. Others allow aftermarket parts if they meet the same specifications. If the contract specifies OEM parts, the buyer must accept longer lead times and higher costs. If aftermarket parts are allowed, the supplier must define which ones are acceptable.

Review parts pricing. Does the service contract include a fixed rate for parts, or is the buyer charged list price? List price changes over time. A fixed rate protects the buyer from inflation. If parts are not included, the buyer should ask for a list of common replacement parts and their estimated costs.

Check lead time guarantees. If a critical part is out of stock, the supplier should state the expected delivery time. For critical loads, a temporary loaner unit or a guaranteed delivery time may be needed.

Red flags to watch for:

• No mention of parts pricing or a reference to “current list price.”
• Aftermarket parts allowed only with prior written approval.
• No lead time guarantee for critical components.
• Parts exclusions that cover high-cost items like alternators.

How are maintenance and testing handled?

Preventive maintenance is part of the service contract. The agreement should state who performs the service, how often, and what is included. Some service contracts require the buyer to perform routine tasks like oil changes and filter replacements. Others include these in the supplier’s scope.

Define testing procedures. After each service visit, the supplier should run a load test. The test duration and load percentage should be specified. A 30-minute test at 100 percent load is standard for many applications. The test report should be provided to the buyer.

Review documentation requirements. The supplier should provide a service report after each visit. The report should list parts replaced, fluids used, and test results. Without documentation, the buyer cannot prove the maintenance was performed.

Red flags to watch for:

• Maintenance intervals that are too long for the operating conditions.
• No load test requirement after service visits.
• Service reports that do not include parts serial numbers.
• Buyer required to source their own maintenance parts.

How are disputes and termination handled?

The service contract should include a dispute resolution clause. If the buyer and supplier disagree on a repair, what happens? A neutral third-party inspection is a common method. The contract should name the inspection process and who pays for it.

Review termination clauses. Can the buyer end the service contract early? If so, what is the notice period? What happens to prepaid service fees? The contract should state whether the balance is refunded or applied to the next contract.

Check the force majeure clause. Natural disasters or supply chain disruptions may delay service. The clause should define what events are covered and how long the supplier is excused from SLA obligations. If the clause is too broad, the supplier may claim a delay for reasons that are not outside its control.

Red flags to watch for:

• Termination fees that are a percentage of the total contract value.
• Force majeure clauses that cover supplier internal issues.
• Dispute resolution that requires arbitration in a foreign jurisdiction.
• No process for documenting and approving repair scope.

What documents should be kept with the service contract?

Keep a physical or digital copy of the signed service contract. Include all addenda and amendments. The contract should reference the genset serial number and model. A mismatch between the contract and the equipment can void coverage.

Keep maintenance records. Each service visit should have a signed report. Store these in a folder labeled with the genset serial number. If a warranty claim is denied, maintenance records are the first document the supplier reviews.

Keep invoices for parts and labor. If the service contract covers parts, the invoice should show the supplier charged the buyer zero for those items. If the contract covers labor, the invoice should show the correct rate. A mismatch indicates a billing error.

Keep test reports. Load test reports prove the genset was operated as specified. If the warranty requires a minimum load, the test report shows the actual load.

Red flags to watch for:

• Service contract references a different serial number than the equipment.
• Maintenance records that are not signed by the supplier technician.
• Invoices that show charges for items covered under the service contract.
• Test reports that do not include the date and the load percentage.