What should be included in a BMS maintenance visit?
For many building owners, facilities managers and estates teams, BMS maintenance is something they know they need, but the detail of what should actually be covered is often less clear.
A proper BMS maintenance visit should be about more than simply attending site, looking at a screen and confirming that the system is still running. The real purpose of maintenance is to keep the system stable, usable and supportable, while identifying issues early before they develop into faults, disruption or loss of control.
What is included will vary depending on the age of the system, the complexity of the site and the level of support required. However, there are some core areas that a good maintenance visit should always address.
It should start with the overall health of the system
A maintenance visit should begin with a general review of system condition and performance.
That means checking whether the head-end, supervisor or front-end software is running correctly, whether communications are healthy, whether controllers are online, and whether there are any obvious issues affecting overall stability. If the BMS is difficult to use, repeatedly dropping out, showing communications faults or generating persistent errors, those issues should be identified and logged rather than simply ignored because the plant is still running.
The aim at this stage is to understand whether the system is fundamentally healthy and whether there are any emerging concerns that need attention.
Graphics, alarms and usability should be reviewed
One of the most common frustrations for site teams is a BMS that technically works, but is difficult to use in practice.
A maintenance visit should include a review of graphics, navigation and alarm presentation to make sure operators can actually understand what the system is telling them. Graphics that are unclear, outdated or no longer reflect the building make fault finding harder and reduce confidence in the system. The same applies to alarms that are excessive, unclear or no longer relevant.
Alarm review is particularly important. A BMS with too many nuisance alarms often becomes a system nobody trusts. A good maintenance visit should consider whether alarms are meaningful, whether recurring alarms are being investigated properly, and whether the operator is being given useful information rather than background noise.
Backups should always be part of the visit
One of the most important parts of BMS maintenance is often one of the easiest to overlook.
A maintenance visit should include checking that backups are in place and up to date. This may include supervisor backups, controller strategy backups, graphics files, databases and any relevant project or application files needed to recover the system in the event of failure.
If backups are missing, outdated or untested, the site may be carrying far more risk than people realise. A system may appear to be operating normally right up to the point where a failure occurs and it becomes clear that recovery information is incomplete or unavailable.
Good maintenance should reduce that risk, not just react once it becomes a problem.
Controllers and field devices should be checked sensibly
A maintenance visit should include review of controller health and, where appropriate, field-level issues that may be affecting performance.
This does not necessarily mean checking every point on every visit, but it should include sensible review of controller status, I/O health, communications issues and any obvious device-related concerns that may be affecting control. If sensors are reading implausibly, actuators are not responding properly or key points are in override, that should be picked up and investigated.
Where trends or historical data are available, they can be useful in identifying whether a site has underlying control issues that are not immediately obvious during a short visit.
The visit should consider how the building is actually operating
A good maintenance visit is not only about checking the hardware and software. It should also include some level of review of how the system is performing in relation to the building.
For example, are schedules still aligned to occupancy? Are plant start and stop times sensible? Are there recurring comfort complaints? Are heating and cooling systems behaving as intended? Has the building layout changed since the controls were last reviewed?
This matters because many BMS issues are not outright failures. Quite often, the system is still operating, but not in a way that best supports the building. Maintenance visits are a useful opportunity to spot where performance has drifted and where further optimisation or adjustment may be needed.
Site changes should be picked up, especially after refurbishments
This is particularly important in buildings that have been altered over time.
For example, office spaces are often refurbished on a speculative open-plan basis before a tenant is in place. Once occupied, those layouts are frequently changed with new partitions, meeting rooms, cellular spaces or shifts in occupancy density. If those changes are not reflected in the controls strategy, environmental issues can follow, including uneven temperatures, poor air distribution, control instability or local plant operating in ways that no longer suit the space.
A good maintenance visit should be alert to these kinds of changes. It is often one of the first opportunities to identify where the BMS no longer matches the building as it is now being used.
Reports and follow-up actions should be clear
A maintenance visit should produce something useful for the client, not just a tick in a diary.
That should normally include a clear summary of what was reviewed, what issues were found, what was done during the visit, and what actions are recommended next. If faults, risks, obsolete components, backup concerns or optimisation opportunities are identified, they should be recorded in a way the client can understand and act on.
A good maintenance report does not need to be overcomplicated, but it should provide enough clarity to support decision-making and help the client understand the condition of the system.
What clients usually want to know
From a client’s perspective, the main question is often whether the maintenance visit is genuinely helping protect the building and the system, or whether it is simply a routine attendance with little real value.
Most clients want confidence that the BMS is stable, supportable and being looked after properly. They want issues identified before they become failures, and they want to know whether the system still reflects the needs of the building. They also want maintenance visits to produce useful information rather than vague reassurance.
In practice, the most valuable maintenance visits are the ones that combine technical checks with practical insight into how the system is actually performing.
A good visit should support the bigger picture
BMS maintenance is not only about keeping the system online. It should also help support reliability, usability, energy performance and informed decision-making over time.
That means maintenance should connect with wider issues such as recurring alarms, comfort complaints, changes in occupancy, optimisation needs, ageing hardware, backup resilience and future upgrade planning. Where those issues are visible, a maintenance visit should help bring them to light rather than treating them as separate matters for another day.
That is often what separates meaningful maintenance from a simple inspection.
Final thought
A good BMS maintenance visit should do more than confirm that the system is still on. It should help protect the installation, improve visibility of risks, support day-to-day usability and give the client confidence that the system is being managed properly.
In practical terms, that means reviewing system health, alarms, graphics, backups, controller condition, building operation and any changes that may have affected the way the controls should work.
The best maintenance visits are the ones that leave the client with a clearer understanding of both the current condition of the system and the next steps needed to keep it working well.
Need support with BMS maintenance?
If you want a more practical and useful approach to maintaining an existing BMS, we can help review your current system and identify the level of support that best fits your building.
