When a hyperbaric chamber has operated consistently for months or years, your clinical team becomes familiar with what “normal” looks and sounds like. Staff know approximately how long the chamber takes to reach treatment pressure, how the controls respond, and how the system typically behaves during compression and decompression. So when a chamber suddenly begins taking longer to pressurize, it is worth paying attention.

A slower-than-normal compression does not automatically mean that the chamber is unsafe or that a major component has failed. Pressurization time can be influenced by the chamber model, operating settings, prescribed compression rate, supply conditions, patient considerations, and other variables. Operators should always follow the chamber manufacturer’s instructions and their facility’s approved procedures rather than attempting to make a chamber pressurize faster simply because a cycle seems slower than usual.

However, when a chamber that previously performed consistently begins taking noticeably longer to reach its intended treatment pressure under otherwise comparable operating conditions, that change can be an important maintenance clue. Hyperbaric chambers are complex systems that rely on the coordinated performance of the pressure supply, valves, regulators, seals, controls, exhaust components, and other mechanical or electronic systems. A change in one area can affect the performance of the entire system. What initially appears to be a minor inconvenience may therefore be the first observable symptom of a developing equipment problem.

This is one reason performance trends matter so much in hyperbaric maintenance. A chamber does not always go from “working perfectly” to “completely down” overnight. Components can deteriorate gradually, leaks can develop, valves can wear, regulators can lose performance, and supply conditions can change.

1. First, Determine Whether the Pressurization Time Has Actually Changed

Before assuming there is a mechanical problem, establish a reliable baseline. Hyperbaric treatment protocols do not all use identical compression rates, and operators may intentionally adjust compression based on the treatment protocol, patient tolerance, or manufacturer-approved operating procedures. Therefore, comparing one treatment with another without considering those variables can create a misleading picture. Instead, look for a repeatable change under comparable conditions.

Ask:

Is the same chamber consistently taking longer?
Is the same treatment pressure being used?
Are operators following the same approved compression procedure?
Has the change occurred across multiple treatments?
Did the change begin suddenly or gradually?
Have there been recent repairs or adjustments?
Are other chambers at the facility experiencing the same issue?

Documenting these details gives the service technician useful information before troubleshooting begins. Small performance changes can be valuable diagnostic clues—especially when they are tracked over time. This is also why strong chamber logs matter. Patterns that appear insignificant during a single treatment may become much more obvious when several weeks or months of operational information are reviewed together. For more on what your records may reveal, see BaroServ’s What’s Hiding in Your Hyperbaric Chamber Logs?.

2. A Leak May Be Affecting Chamber Performance

One possible reason for slower pressurization is leakage somewhere within the pressure system. For a chamber to reach and maintain its intended operating pressure, the incoming flow must overcome normal system losses. An abnormal leak can make that process less efficient.

Potential leak locations vary by chamber design but may involve areas such as:

Door seals
Gaskets
Fittings
Tubing or hoses
Connections
Valves
Penetrations
Other pressure-system components

Not every leak is obvious. Some may produce a noticeable sound or other visible indication, while smaller leaks may be identified only through appropriate inspection and testing. A chamber that eventually reaches treatment pressure is not necessarily free of a developing leak. If pressurization performance has changed, the reason should be investigated rather than assuming the chamber is fine simply because it eventually reaches the desired pressure.

Operators should not attempt unauthorized adjustments or repairs to compensate for a suspected leak. The appropriate response is to document the change and have the system evaluated according to manufacturer instructions and facility procedures.

3. Regulators and Pressure-Control Components May Need Evaluation

Regulators and pressure-control components play an important role in controlling gas flow and pressure throughout the chamber system. Over time, mechanical components can wear, become contaminated, drift from expected performance, or otherwise require service. Depending on the chamber design, a regulator or related control component that is no longer performing as intended may affect the chamber’s ability to pressurize consistently.

A technician may need to evaluate:

Regulator performance
Supply pressure
Flow behavior
Control settings
Mechanical condition
Associated valves and fittings

This is exactly why troubleshooting should focus on the system rather than immediately replacing the first component that appears suspicious. If a facility repeatedly replaces individual parts without identifying the underlying cause, the same operational problem can return. That is one of the reasons BaroServ recommends looking at repeat problems as a pattern rather than a series of unrelated repairs.

4. Valve Performance Can Affect Pressurization

Valves are another important part of the chamber’s pressure-management system. Depending on chamber design, valves help control the introduction, regulation, isolation, and exhaust of gases during different stages of operation. If a valve does not open, close, or regulate as intended, chamber performance may change.

Potential issues can include:

Mechanical wear
Internal leakage
Restricted movement
Contamination
Seal deterioration
Improper adjustment
Component failure

The exact diagnostic process depends on the chamber and system involved. This is also where technician experience becomes especially valuable. Similar symptoms can have very different causes, and replacing parts based solely on symptoms can become expensive very quickly. A qualified technician should evaluate the complete pressure-control system and determine why performance has changed before recommending corrective action.

5. The Problem May Be Outside the Chamber

One of the most important troubleshooting principles is also one of the easiest to overlook. The chamber itself may not be the source of the problem. The pressure supply and facility infrastructure supporting the chamber can affect its performance.

Depending on the system, technicians may need to evaluate factors such as:

Available supply pressure
Gas or air delivery
Facility piping
Filters
Regulators upstream of the chamber
Supply restrictions
Utility-system changes
Other equipment sharing the same supply

This becomes particularly important if more than one chamber begins displaying similar symptoms at approximately the same time. If multiple chambers suddenly take longer to pressurize, the possibility of a shared supply or facility issue should be considered as part of the troubleshooting process rather than assuming that several independent chamber components failed simultaneously.

Hyperbaric systems exist within a larger safety environment. NFPA 99 includes a dedicated chapter covering hyperbaric facilities and addresses electrical, fire, pressure, gas, maintenance, and operational considerations associated with these environments. Good troubleshooting starts by looking at the complete system.

6. Filters or Flow Restrictions May Be Contributing

Restricted flow can also influence system performance. Depending on the chamber design and supporting equipment, filters and other components within the supply system can accumulate contamination or become restricted over time. A restriction may reduce available flow even when the system still appears operational. That is why maintenance should include more than checking whether the chamber simply “works.” The technician should evaluate whether the system is performing as expected.

A chamber that reaches treatment pressure eventually but takes progressively longer to do so may be providing useful evidence that something within the system is changing. Ignoring that trend eliminates an opportunity to investigate the problem while the equipment is still operational.

7. Seals, Gaskets, and Other Wear Components Age

Hyperbaric chambers contain components that experience repeated mechanical use. Every treatment cycle subjects portions of the system to changes in pressure, movement, loading, and environmental conditions. Over years of operation, wear components may require inspection, adjustment, or replacement.

Depending on the chamber, these may include:

Seals
Gaskets
O-rings
Flexible tubing
Hoses
Valve components
Door-related components

This is one of the reasons preventive maintenance is so important. Preventive maintenance provides an opportunity to identify deterioration before it progresses into a larger operational problem. It also forms part of a much larger lifecycle strategy. BaroServ’s Hyperbaric Chamber Maintenance Timeline: From Installation to 20-Year Overhaul explains how routine maintenance, component replacement, Mechanical Overhauls, and Cylinder Overhauls fit together throughout a chamber’s service life. For the broader technical framework, ASME PVHO-2 provides technical criteria and guidelines for the operation and maintenance of Pressure Vessels for Human Occupancy and PVHO systems.

8. Chamber Age and Service History Matter

A performance change should never be evaluated without considering the chamber’s history. A relatively new chamber with consistent maintenance presents a different troubleshooting picture than an older chamber with incomplete records, repeated repairs, or deferred lifecycle work.

Important questions include:

How old is the chamber?
When was its last preventive maintenance?
What repairs have recently been performed?
Have similar problems occurred before?
Have the same components been replaced repeatedly?
Has the chamber undergone appropriate lifecycle service?
Are there unresolved recommendations from previous service reports?

If a chamber is approaching a major mechanical service milestone, declining performance may justify a broader evaluation rather than another isolated repair. Annual preventive maintenance and a 10-Year Mechanical Overhaul are not the same service and do not serve the same purpose. BaroServ’s Do You Need an MOH or Just a PM? explains why chamber age, condition, service history, and the scope of required work should be considered together.

9. Recent Service or Component Replacement Can Provide Important Clues

If pressurization changed shortly after maintenance or repair work, tell the service provider. That does not necessarily mean the previous work caused the problem. However, the timing is diagnostically important.

Technicians may need to review:

Components recently replaced
Adjustments made during previous service
Connections that were disturbed
Calibration or control changes
Previous service recommendations
Whether the original complaint was completely resolved

Good troubleshooting depends on having an accurate history. The more information your facility can provide, the easier it becomes to determine whether the current symptom is new, recurring, or potentially related to another condition.

10. Don’t Compensate for the Problem—Investigate It

One of the worst responses to changing chamber performance is simply adapting to it. If staff begin scheduling extra time because “this chamber always takes longer now,” a potentially useful warning sign can gradually become accepted as normal. That is how developing equipment issues sometimes remain unresolved.

A change in performance should be:

Documented
Compared with previous performance
Reported appropriately
Evaluated when warranted
Corrected according to applicable procedures

Operators should never make unauthorized modifications, bypass safety systems, alter controls outside approved procedures, or attempt to force faster pressurization.

The U.S. Food and Drug Administration’s current HBOT safety recommendations specifically remind healthcare providers and facilities to follow each device manufacturer’s instructions, maintain appropriate staff training, follow recommended maintenance intervals and safety checks, and maintain fire-prevention measures when operating hyperbaric oxygen therapy devices.

When Should You Call for Service?

Not every variation in compression time requires an emergency service call. But a consistent, unexplained change from the chamber’s normal performance deserves attention.

Contact your service provider when:

Pressurization time has noticeably increased without an operational explanation
The problem is becoming progressively worse
The chamber struggles to reach or maintain the prescribed pressure
Unusual sounds or other abnormal behavior accompany the change
A leak is suspected
Multiple treatments are being affected
Operators receive alarms or abnormal indications
The chamber recently underwent repair and the symptom has returned
Your team is uncertain whether continued operation is appropriate

If there is any concern about safe operation, follow the manufacturer’s instructions, your facility’s procedures, and applicable clinical and safety protocols. A service provider can then evaluate whether the problem originates with the chamber, a component, the pressure supply, or another part of the supporting system.

Why Early Diagnosis Matters

A chamber that is taking slightly longer to pressurize may seem like a minor operational annoyance. But trends matter. Today it may mean an extra few minutes. Later, depending on the cause, it could progress into difficulty reaching treatment pressure, repeated repairs, canceled treatments, or unplanned downtime.

That progression is not inevitable, and slower pressurization does not automatically predict a chamber failure. But identifying the cause early gives the facility more options. Planned troubleshooting allows hospitals to coordinate service, obtain purchasing approval, source parts, and schedule downtime more effectively than an unexpected failure does. That is the larger purpose of preventive maintenance: not simply checking boxes once a year, but recognizing changes before they become more disruptive.

The Bottom Line

A hyperbaric chamber taking longer than usual to pressurize is a symptom—not a diagnosis. The cause could involve a relatively straightforward operating or supply condition, or it could point to leakage, component wear, flow restriction, pressure-control issues, or another developing mechanical problem. Without proper evaluation, there is no responsible way to determine the cause based on pressurization time alone.

What matters most is recognizing when the chamber’s behavior has changed. Facilities that document those changes, maintain strong service records, communicate observations to their technicians, and investigate recurring performance issues are better positioned to address problems before they become expensive emergencies.

A chamber does not have to stop working completely before it deserves a closer look. Changes in pressurization, pressure stability, unusual sounds, recurring alarms, or repeated repairs can all provide valuable information about the condition of the system. The earlier those patterns are identified and properly evaluated, the more control the facility has over what happens next.

Is Your Chamber Performing Differently Than It Used To?

If your hyperbaric chamber is taking longer to pressurize, struggling to maintain pressure, experiencing repeat failures, or simply behaving differently than it has historically, BaroServ can help identify the cause.

Our technicians service hyperbaric chambers across multiple manufacturers and can evaluate chamber performance, pressure systems, mechanical components, service history, and supporting equipment to help determine the appropriate next step. Whether the solution involves preventive maintenance, troubleshooting, replacement parts, repair, or broader lifecycle service, the goal is to identify the actual problem—not simply treat the symptom.

BaroServ: Premium Hyperbaric Chamber Maintenance. Faster. Safer. Certified.