Note
Planned Maintenance or Full Cover: Two Different Contracts
When a factory client asks for “maintenance,” they have something in mind. When you say you offer “maintenance,” you may mean something different. Neither of you is wrong yet. The problem arrives when a fault comes in at 6pm on a Tuesday, the customer expects you on site by morning, and you expected to show up in April and October as agreed.
The mismatch does not start at the fault. It starts when two parties signed a contract that called itself a maintenance agreement without specifying which kind.
What Is a Planned Preventive Maintenance Contract?
A planned preventive maintenance (PPM) contract commits to scheduled visits. You arrive on agreed dates, complete defined checks, and deliver a signed inspection report. Nothing more is promised between those visits.
For a factory with a C&I solar installation and industrial LED lighting, a PPM schedule typically covers:
- Two visits per year: one before the wet season and one after
- Inverter error-log review, cooling fan check, and DC connection torque verification at each visit
- Panel cleaning on the same schedule
- LED lux measurement and driver inspection at the annual visit
- A written, signed report for the factory’s compliance file
The contractor’s obligation begins when they arrive on site and ends when the report is signed. Faults that occur between visits are the customer’s to report, and the contractor responds at a separately agreed rate.
This is a clearly bounded commitment. You can staff it with confidence because you know exactly when the work falls. You can price it accurately because the number of technician-days required is calculable from the visit schedule alone. You carry no open-ended obligation between visits.
What Does Full Coverage Add?
A full-coverage maintenance contract adds a response obligation. When the customer reports a fault between scheduled visits, you commit to attending within an agreed window. Coverage typically includes labor for diagnosis and, depending on the agreement, parts and repair up to a defined scope.
This is a fundamentally different commercial arrangement. The PPM contract defines work by schedule. The full-coverage contract defines work by event. You do not know when faults will occur, how serious they will be, or how many technician-hours they will consume in a given year.
For a large C&I solar installation where production loss is expensive and the factory runs continuous shifts, the client may reasonably require it. The contract commits you to arriving within an agreed window after a confirmed fault report, diagnosing the problem, and carrying out covered repairs.
The difference from PPM is not just operational. It is financial. An unplanned response call absorbs:
- Travel time not accounted for in your schedule
- Technicians redirected from other jobs or drawn from standby
- Diagnostic time that may not lead immediately to a repair (parts may be on order)
- A second trip if consumables or components are needed
None of this is recoverable under a fee set for scheduled visits only. Pricing full coverage requires you to forecast how many reactive calls a site is likely to generate per year. For a new installation, that number is genuinely uncertain.
What Does Each Model Commit You to Operationally?
The practical difference comes down to predictability.
PPM only: Your team knows the full visit schedule twelve months ahead. April and October for a particular factory means you can allocate crew, arrange site access, and confirm factory availability well in advance. Reactive calls between visits are billed separately as they occur.
Full coverage: Every fault report is a trigger requiring a response. You need a person available to receive and triage incoming fault reports. You need technicians who can be redirected at short notice, or a defined standby arrangement. You need fast access to spares so common faults can be resolved in a single trip.
Worked example: A contractor holds PPM agreements for 12 factory sites, two visits each, one technician-day per visit. Annual planned load: 24 technician-days, concentrated in April and October. Predictable and staffable.
Under full coverage for the same 12 sites, the 24 planned visits remain. If each site averages two reactive fault reports per year, that adds 24 unplanned visits, some under a full day, some requiring a follow-up for parts. The reactive load could range from 20 to 40 technician-days in any given year. That variance is what makes full coverage harder to staff and price.
Which Type Should You Offer?
For most Thai C&I electrical contractors building a maintenance portfolio for the first time, PPM-only agreements are the operationally realistic starting point.
PPM agreements are:
- Predictable enough to staff without dedicated standby
- Priced on a calculable technician-day basis
- Defined clearly enough that disputes about coverage are rare
Full-coverage agreements make sense when:
- The client’s production sensitivity makes rapid fault response a genuine requirement
- You have the technician capacity to absorb reactive calls without disrupting your project pipeline
- You have data from similar sites to estimate the likely reactive call volume
- The agreed fee accounts for the additional risk and response obligation
Both are standard commercial structures. The question is which one your operation can deliver reliably, at the fee you have agreed, for the full term of the contract.
Before you price a maintenance agreement, confirm which type the client expects, and make sure the scope document reflects that clearly. One sentence at the beginning of the agreement prevents the disagreement that arrives at 6pm.
FAQ
Is a maintenance agreement the same as a warranty extension?
No. A warranty covers defects in the original work or equipment within a specified period. A maintenance agreement is a service contract for ongoing upkeep of a working installation. The two can run concurrently, but a maintenance agreement does not extend the installer’s workmanship warranty unless that is written explicitly into the terms.
Can you start with PPM and move to full coverage later?
Yes. Starting with PPM lets you build a record of the site’s fault history over the first year. After twelve months, you have real data on how often the site generates reactive calls and how complex they typically are. You can price full coverage accurately from that record. Include a clause in the original PPM agreement allowing for annual scope renegotiation.
Does a PPM visit cover faults found during the scheduled inspection?
A scheduled visit is an inspection and maintenance call, not an open repair session. If a technician finds a failed component during a visit, the report documents it. Whether you fix it during the same visit at no additional charge, or schedule a separate repair call, depends on what the agreement says. Write that clause clearly at the start. The assumption that “you’re already there, so fix it for free” is one of the most common sources of maintenance billing disputes.
Building your maintenance portfolio on clearly typed contracts reduces the number of difficult conversations when something goes wrong, and lets you price each agreement accurately.
To see how TRACE 30 organises the closing gate and site register that supports both PPM and full-coverage operations, visit /program/ or schedule a call.