An intercom problem is not always obvious. The entrance panel may light up and place a call, but the person inside may not hear the visitor, the video may be unusable, or the door may remain locked after access is approved.
For a condo, office, school, clinic or commercial property, that turns a communication fault into a security and accessibility concern.
Quick answer: Commercial intercom maintenance should test the entrance station, audio in both directions, video, directory, resident or staff endpoints, mobile calling, network connection, door-release command and the actual door hardware. The full sequence should also be tested during a controlled power or internet interruption where the system design allows it.
Intercom Symptoms and Likely Causes
| Symptom | Likely cause | What should be checked |
| Visitor can hear staff, but staff cannot hear the visitor | Failed microphone, blocked opening, wiring fault or audio setting | Entrance microphone, grille, cabling and audio levels |
| Audio cuts in and out | Weak network connection, damaged cable, moisture or failing station | Network logs, cabling, connectors, PoE and entrance station |
| Video is foggy or washed out | Condensation, dirty lens, low winter sun or failed heater | Lens, seals, housing, exposure and camera position |
| Call reaches the wrong suite or desk | Outdated directory or programming error | Directory database, extension mapping and recent tenant changes |
| Door release clicks, but the door stays closed | Strike or latch misalignment, door pressure or failed relay | Release relay, lock, latch, closer, hinges and door position |
| Door releases, but does not secure again | Door not closing fully, weak closer or lock-status fault | Door alignment, closer, latch, contact and access-control event |
| Mobile calls arrive late or not at all | Internet, cloud service, phone permissions or notification issue | Network path, app permissions, account status and call routing |
| Touchscreen is difficult to use in winter | Moisture, salt film, cold screen or glove interaction | Screen condition, heater, shelter and accessible alternate method |
| System works live but has no event history | Storage, time, database or licence problem | Logs, retention, time synchronization and account settings |
1. Test the Complete Visitor-Entry Sequence
Testing the call button alone does not confirm that the entrance works. An intercom is normally connected to several other parts of the building:
- Entrance station
- Suite station, desk phone or mobile app
- Network switch or telephone interface
- Intercom controller
- Access-control panel
- Electric strike, magnetic lock or gate operator
- Door closer and latch
- Door-position contact
- Security or reception workstation
The test should follow the same steps a real visitor uses:
- Find the correct person or department.
- Place the call from the entrance.
- Confirm that the receiving device rings.
- Speak in both directions at a normal volume.
- Check the video image, where provided.
- Approve entry from the receiving device.
- Confirm that the lock releases before the visitor pulls or pushes the door.
- Open the door, allow it to close and verify that it secures again.
- Confirm that the system records the expected event.
ACS Systems explains this relationship in How Intercoms, Access Control, and Automatic Doors Work Together. A fault that appears to be in the intercom may actually be caused by the lock, closer, hinges or door operator.
Do Not Stop at the Release Sound
Hearing a buzz or click does not prove that the opening released. The relay may have changed state while the latch remained loaded against the strike.
This is common when:
- A door has sagged on worn hinges
- The closer pulls the door too tightly against the frame
- Stack effect creates pressure across a high-rise entrance
- Weatherstripping becomes stiff in cold weather
- The electric strike is out of alignment
- Ice or grit prevents the door from closing fully
The physics are simple: an electric release can move only within its designed load. If wind, air pressure or mechanical misalignment pushes the latch hard against the strike, the visitor may hear the release without being able to open the door.
2. Check Audio in Real Entrance Conditions
Intercom audio should be tested while the lobby and street are operating normally. A quiet early-morning test may miss problems caused by traffic, wind, a busy vestibule or mechanical equipment.
Check for:
- Clear speech in both directions
- Adequate volume without distortion
- Feedback or echo
- Delayed audio on IP or mobile systems
- Wind noise at the entrance station
- Buzzing caused by power or grounding issues
- A microphone opening blocked by dirt, paint or sealant
- A speaker grille packed with dust or salt residue
- Privacy concerns where conversations can be heard by people nearby
Volume should not be increased until the source of poor audio is understood. Excessive speaker volume can create feedback, reduce speech clarity and broadcast private conversations into the lobby.
Test With Different Users
A system that works for one staff member may still be difficult for someone with hearing, speech, vision, reach or dexterity limitations. Include users of different heights and abilities when practical.
An alternate way to request assistance may be needed where a touchscreen, small directory text or audio-only prompt creates a barrier. The exact solution depends on the building, equipment and approved entrance design.
3. Inspect the Camera, Screen and Entrance Housing
Video intercom image quality changes with weather and lighting. Low winter sun can shine directly into the camera. Snow can brighten the background while leaving a visitor’s face dark. Moisture can fog a damaged housing.
Review the image during:
- Bright daylight
- Low morning or afternoon sun
- Overcast weather
- Night lighting
- Falling snow or rain
- Vehicle headlight activity
Look for:
- A face-sized image at normal standing distance
- Useful detail without requiring a visitor to stand too close
- No major blind spot caused by the panel position
- Clean, unscratched camera glass
- No moisture inside the housing
- No nearby light reflecting into the lens
- Correct date and time on stored events
If condensation appears inside the entrance station, cleaning the outside will not solve it. The housing, gasket, cable entry and drainage need to be checked. Opening the unit during wet weather can trap more moisture inside.
4. Review the Directory and Call Routing
Directory errors are a common operational failure. A visitor can use the intercom correctly and still reach a former tenant, an unstaffed desk or a phone that no longer has permission to release the door.
Compare the live directory with:
- Current tenant or resident records
- Staff moves and departures
- Property-management contacts
- After-hours coverage
- Security-desk schedules
- Accessibility assistance contacts
- Emergency and service entries that should not appear publicly
For privacy, avoid displaying more personal information than the building needs. In many properties, a unit number, company name or assigned code is more appropriate than a full resident name.
Review administrator accounts as well. Remove former employees and contractors, require individual accounts where supported, and record who is allowed to edit the directory or change door-release settings.
If the building is planning a new system or major upgrade, What to Consider Before Installing an Intercom System covers wiring, mobile access, video and integration questions.
5. Test Network, Mobile and Cloud Functions
IP and cloud intercoms depend on more than the entrance panel. A working local screen does not prove that remote calls, mobile notifications or cloud management are available.
Check:
- Network-switch and PoE status
- Internet connection used by the intercom
- Firewall or network changes
- Mobile-app notification permission
- Operating-system battery restrictions
- User account and licence status
- Call-forwarding schedules
- Cellular reception at the receiving location
- System time and time zone
- Event-log retention
- Vendor service and support contacts
Place test calls to each type of endpoint used by the property: suite station, reception desk, security phone and mobile app. Confirm that a mobile user can see who is calling, speak with the visitor and release only the intended entrance.
Remote release should not be tested from a screen alone. Have a second person confirm what happened at the physical door.
6. Confirm Backup Operation and Staff Procedure
Every building should know what happens when the intercom loses:
- Utility power
- Internet service
- Local network service
- Cloud connection
- Telephone service
- Connection to the access-control panel
The answers vary by system. Some intercoms retain local calling while mobile functions stop. Some doors continue to accept credentials but cannot be released remotely. A battery may support the controller but not the network switch or electric lock.
Document:
- Which components have backup power
- Expected runtime
- Which functions continue locally
- What users see or hear during an outage
- How visitors contact the building
- Which entrance should be used as an accessible alternative
- Who receives fault notifications
- How the system is reset after service returns
Do not disconnect a required life-safety or access-control connection for an informal test. Controlled outage testing should be planned with the service provider and building team.
The Canadian Edge: Why Intercoms Need a Winter Check
An exterior intercom in Toronto deals with more than cold air.
Autumn Grit Becomes Winter Salt
Dust and grit collect around buttons and speaker openings in autumn. Winter adds salt carried by gloves, hands and blowing slush. Salt attracts moisture and can contribute to corrosion around metal trim, fasteners and connectors.
Freeze-Thaw Cycles Move Moisture
Warm daytime temperatures can melt snow around an entrance panel. The water can enter a damaged gasket or cable opening and freeze overnight. Repeated expansion can worsen the opening and make an intermittent fault more frequent.
Cold Changes the Door Release
The intercom may send the correct command while the entrance remains closed. At low temperatures, weather seals stiffen, lubricants thicken and metal components contract. Stack effect and winter wind add pressure across the door.
This is why the test must include the physical opening. ACS Systems provides intercom installation and service and can also review connected door buzzer systems, access control and entrance hardware.
Snow and Gloves Affect Usability
Small touch targets, reflective screens and controls that respond poorly through gloves can make entry difficult. A canopy may reduce direct snow, but it must not create a barrier or reduce the clear approach to the control.
Accessibility and Privacy Considerations
The 2024 Ontario Building Code came into effect on January 1, 2025. Requirements affecting a particular entrance depend on the building, construction date, occupancy and scope of later work. Review Ontario’s current Building Code information.
CSA/ASC B651:23, Accessible Design for the Built Environment, addresses accessible routes, controls, reach, clear floor space and other built-environment features. Its application depends on the project and authority reviewing the work.
When an intercom forms part of the accessible entrance, check that:
- The approach remains clear
- The control can be reached without entering the door swing
- Instructions and directory information are usable
- The system provides an effective way to request assistance
- Door release does not require excessive force or precise timing
- An outage procedure identifies an accessible entrance or assistance method
The Accessible Canada Act applies to federally regulated organizations, not every Ontario commercial property. It includes the identification, removal and prevention of barriers in the built environment and information and communication technologies. Review the Accessible Canada Act.
Intercom directories, video images and call logs may contain personal information. Limit access to administrators who need it, retain information only as required, and review applicable privacy obligations before enabling recording or remote access.
Commercial Intercom Maintenance Checklist
Entrance Station
Test every call button or directory function
Check audio in both directions
Review daytime and nighttime video
Inspect the camera window and speaker grille
Look for moisture, corrosion and damaged seals
Confirm controls remain reachable and unobstructed
Calls and Directory
Verify all suite, tenant and staff listings
Remove former users and administrators
Test desk, suite and mobile endpoints
Check after-hours routing
Confirm mobile notifications arrive promptly
Review event time, date and retention
Door Release
Release the door from each approved endpoint
Confirm the correct entrance releases
Open the physical door during the test
Confirm the door closes and secures again
Check the closer, latch, strike and hinges
Verify the door-position event where provided
Power and Network
Review PoE, controller and network faults
Confirm internet and cloud status
Check backup-power coverage and runtime
Document outage behaviour
Confirm staff know the temporary entry procedure
Retest after power, network or programming changes
Frequently Asked Questions
How often should a commercial intercom be tested?
High-use entrances should receive frequent operational checks. A documented test of audio, video, directory, call routing and door release can be completed monthly or quarterly, with qualified service based on faults, manufacturer instructions and building risk.
Why does the intercom buzz without opening the door?
The relay may be working while the latch or strike is under pressure. Door sag, closer force, stiff seals, wind or stack effect can prevent the opening from releasing.
Can an intercom work without the internet?
Some systems retain local functions, while cloud calling and mobile access stop. The building should test and document the behaviour of its exact system.
Is a video intercom recording all the time?
Not necessarily. Some show live video only, while others store call images or event clips. Check the settings, retention and privacy requirements.
Can staff clean an exterior intercom with a general cleaner?
Use the manufacturer’s approved method. Harsh cleaners, excess water and sharp tools can damage microphones, screens, lenses, coatings and seals.
Is an intercom part of accessibility compliance?
It can be when it is required to gain entry through an accessible route. Placement, reach, communication method and the connected door all affect whether the entrance can be used independently.
Schedule an Intercom and Entry-System Test
If calls are being missed, audio is unclear or the release works only some of the time, test the complete entrance before winter makes a small problem harder to diagnose.
ACS Systems installs and services commercial intercom systems across Toronto and the GTA. The inspection can include the entrance station, directory, network, mobile calling, access-control connection, door release and physical entrance operation.
Contact ACS Systems to arrange an intercom and controlled-entry inspection.
Trust Note From ACS Systems
This article provides general guidance for commercial, institutional and multi-residential properties. Intercom, privacy, accessibility, electrical and door requirements vary with the building, equipment, approved design and applicable law. Changes should be completed by qualified personnel and reviewed against the requirements that apply to the property.
