When Quick Fixes Linger: The Risks and Costs of Forgotten Manual Overrides

Manual overrides are a fact of life in commercial buildings, including overrides of equipment and control settings within a building automation system (BAS). Normally, a building's BAS operates equipment according to programmed schedules, sensor readings, and control logic designed to maintain occupant comfort and safety while managing energy use. An override is a manually forced adjustment or correction that takes precedence over that normal operation.

Most facilities departments have performed their share of manual overrides on BAS equipment and controls. Often, it happens when an immediate operational need crops up, such as a space becoming overheated or overcooled, or a change in operating hours. An occupant may complain about a conference room that's too hot, for example, prompting a temporary change in a temperature setpoint. Or perhaps there's an after-hours event that requires manually adjusting a schedule to accommodate extended conditioning.

Manual overrides can also be used as a work-around for a problem, such as a faulty sensor, a stuck damper, or an improperly functioning piece of equipment. In some cases, overrides are performed when a system or equipment needs to be maintained, tested, and verified.

Operators can apply an override through the BAS software by forcing a control point, such as a valve position or temperature setpoint, to a selected value instead of allowing the program to determine it. Or they can perform an override on the equipment itself, so that the equipment follows a local instruction instead of the BAS command.

Manual Overrides Mean More Wasted Energy

Manual overrides serve a necessary function. But they can also be a problem for facilities departments tasked with keeping the building operating comfortably, safely, and efficiently.

An override that remains in place prevents the system from returning to its intended operational state, which can in turn increase energy usage and create a cascade of other issues.

In one study of hospital facilities, researchers found that chronic overrides consumed 10-20% more energy than expected, with 70% of manual overrides remaining active for over 30 days.¹ Another study conducted by the Lawrence Berkeley National Laboratory found that upwards of 30% of commercial-building energy waste can be attributed to controls-related problems, including manual overrides.²

Additional research revealed that 35% of after-hours energy waste was the result of uncleared manual schedule overrides.³ When setback schedules in normally unoccupied spaces are overridden to permanent occupied status, facilities see 30-40% of after-hours energy consumption.⁴ In short, just one forgotten override can cost anywhere between $500 and $1,500 per month in wasted energy.⁴

So what does that look like in action? Here's an example. An air-handling unit is overridden to operate in occupied mode for an evening event, and the override is never cleared after the event is over. As a result, the HVAC equipment remains running beyond the hours it's needed, maintaining occupied temperatures in an empty space. This wastes energy and racks up costs.

Override Impact on Occupant Comfort and Safety

Manual overrides are often enacted to address an occupant complaint, but then are forgotten-resulting in yet more complaints. For example, an overcrowded conference room becomes too warm during a meeting. Facilities staff manually force the room's VAV damper to fully open and deliver more cooling air. But after the meeting is done, the override is kept in place instead of returning the damper to automatic control. Now the next people to use the room complain that it's freezing cold and drafty.

Manual overrides may become a safety as well as comfort issue when they prevent equipment from responding to a hazardous condition, interfere with protective systems, or allow machinery to run when someone is working on it. An inappropriate override of a fan or damper, for instance, could disrupt a building's intended response to a fire. Or forcing an exhaust fan to close could impair the removal of airborne contaminants and impact air quality.

An override becomes particularly risky if it bypasses the device or circuit intended to stop equipment when conditions are unsafe. For example, fire-damper controls often include smoke detection and high-temperature limits. Manually overriding these controls, say during routine testing, could disable those critical protections.

Unnecessary Service Calls

Another potential downside of manual overrides is unnecessary service calls. Forgotten overrides can end up looking like equipment failure, when in reality, the only action required is a return to normal operations. For instance, say someone overrides a zone's setpoint to address a comfort complaint and never releases it. Occupants then start complaining that the space is too hot or too cold, prompting an unneeded service call.

Or let's say a unit is forced on for testing and remains overridden. Staff later report that the unit won't shut off. What appears to be a scheduling malfunction is actually just a manual command. When manual changes aren't documented, other operators don't know the override was applied. Without an audit trail, troubleshooting these issues takes longer and can result in more disruption and higher costs.

Unexpected Costs of Manual Overrides

Speaking of costs, manual overrides can have expensive consequences as well. A refrigeration technician, for example, temporarily disables a freezer's high-temperature alarm system while performing routine maintenance to avoid triggering a nuisance alert. Once the maintenance is done, the technician forgets to re-enable the alarm. Temperatures inside the freezer start to rise, but because the alarm is still disabled, no one is notified. The issue goes unnoticed overnight, putting frozen inventory at risk.

The problem isn't that someone used an override, but that the override was kept in place beyond the point at which it was originally needed. Long-term overrides can lead to longer equipment runtimes, including nights and weekends, with fans, pumps, HVAC equipment, lighting, and other systems operating when they're not needed.

This can translate into significant costs related to wear and tear. A 100,000-square-foot property, for instance, can expect to spend around $100,000-$300,000 a year on maintenance and repair.⁵ Those costs go up significantly when manual overrides lead to equipment breakdown and replacements.

A Quick Fix for an Underlying Problem

Recurring manual overrides are sometimes used as a Band-Aid for a more serious underlying problem. Let's say an airflow controller reports that a zone isn't receiving adequate airflow. A manual override can temporarily remove the symptom, but it won't reveal the true source of the issue: an undersized duct, a stuck damper, or a faulty sensor, for instance.

The real crux of the issue is that overrides often interfere with a system's automated sequences, which means the override may be preventing the system from doing what it normally does. A manual override meant to address one immediate need can end up extending operation beyond that need. Think back to the HVAC equipment continuing to run in an empty space, even when guests from an after-hours event are long gone.

What's Really Going On

If your facilities team, building engineers, and technicians find themselves manually overriding certain systems repeatedly, that may be evidence that something is wrong and should be investigated. Repeated overrides can be an indication that the building's normal automatic operation isn't doing what it's supposed to.

If staff continually bypass the same controls, they may be compensating for a problem when they should be resolving it. Let's look at a few illustrative examples.

Overheated Space

• Cause for the override: Staff keep lowering a zone's cooling setpoint when occupants complain it's too hot.
• What could be happening: The issue could stem from an inaccurate sensor, inadequate airflow, or a change in the space's cooling needs.
• What to investigate: Compare sensor readings with actual conditions, check the airflow and equipment response, and reassess the current space use.

Unlit Working Space

• Cause for the override: Facilities regularly bypass occupancy-based lighting controls because the lights keep switching off while employees are still working.
• What could be happening: The occupancy sensor may be obstructed, have inadequate coverage, or be in a location that no longer suits the room's layout.
• What to investigate: Make sure no furniture is blocking the sensor. Or check to see if there's a coverage problem that may mean automatic lighting control isn't the best option for the space.

Failed Float Switch

• Cause for the override: A pump meant to collect water in a basement fails to start automatically, causing staff to manually command the pump control panel to drain the pit.
• What could be happening: The pump motor might still be working, but the float switch may have experienced electrical failure and may no longer be sending the start signal.
• What to investigate: Test to identify whether the switch is defective, obstructed, or impacted by another electrical fault.

Managing Your Manual Overrides

Overrides aren't always avoidable, but there are strategies you can implement to help minimize the potential issues of frequent and forgotten manual overrides. Here's a simple guideline to help get you started.

1. Conduct regular override audits. A study completed by the Smart Buildings Academy indicates that weekly audits reduce the total number of manual overrides by 60% within three months.¹

2. Train building operators. Make sure building operators, technicians, and facilities staff know how to use the BAS software as well as proper methods for removing manual overrides and resuming normal operations.

3. Resume automatic operation. Once you've reviewed active overrides, return equipment to automatic operation when appropriate.

Keep in mind that setting the system back isn't always the same as giving control back to the system. Simply writing a different value may leave the manual override in place. The override must be relinquished at the relevant priority so another command can take over.

4. Document and track all overrides. Keep a log of all manual overrides performed, including the reason for the override and the team member who's responsible for removing it and/or resolving the issue that necessitated it.

Indeed, logging overrides can cut recurring issues by 50%.¹ Additional research shows a schedule compliance rate of 96% when override documentation is required once the incident is resolved.³

5. Use expiration tags. Setting an expiration tag that automatically clears the override after a certain number of days has been shown to reduce long-term overrides by 80%.¹ Data also reveals a 22% runtime reduction when override events are tracked and cleared on schedule.³ And operators saw four times faster override resolution with automated alert routing versus manual BAS review.³

6. Investigate the root cause. Rather than treating the override as the repair, take the time to figure out why the action was needed in the first place and what the underlying issue may be so corrective measures can be taken.

7. Conduct periodic outside reviews. Bring in an experienced outside service provider with expertise in BAS to conduct comprehensive audits of manual overrides. This partner may identify overlooked and unnecessary overrides, as well as diagnose potential underlying issues for remediation.

The important take-away isn't that overrides are bad and automation is good, but that each override should have a defined purpose, a documented record, an accountable owner, and a clear path back to normal operation. If you're interested in conducting an audit of manual overrides in your facilities and developing an override process, reach out to your local Albireo Energy representative today.

Authored with contributions from Keith Lorenzen, Service Manager of the New England Division, and Tony Antonitus, Service Operations Supervisor.

Sources
1. "The Hidden Cost of Manual Overrides in Hospitals." Smart Buildings Academy. 2025.
2. Guanjinh, Lin et al. "Can We Fix It Automatically? Development of Fault Auto-Correction Algorithms for HVAC and Lighting Systems." Lawrence Berkeley National Laboratory. August 2020.
3. Turley, Josh. "BAS Schedule Override Monitoring for After-Hours Waste." Oxmaint. June 16, 2026.
4. "Energy Efficiency and HVAC Set-point Optimization Checklist." Oxmaint. February 18, 2026.
5. Tawasha, Rami. "Commercial Property Maintenance Guide." Constructive Solutions. July 29, 2026.