Products
Fault detection that runs on site, around the clock. Every unit is checked continuously against what it should be doing, and each fault is named with its likely cause.
Inside a unit
Open any unit to see each diagnostic, its status and what it found. Discharge air off setpoint is told apart: out of capacity with the valve wide open, out of control with room to spare, or the other coil fighting it.
A sensor that is offline or reads an impossible value is named and set aside, so one bad reading never turns into a false fault. A check that needs a sensor the unit does not have says so, and can be hidden.
| Diagnostic | Status | Details |
|---|---|---|
| Discharge air | Warning | 8 °F above setpoint for 1 d 6 h. Cooling valve fully open: out of capacity, not out of control. |
| Duct static | Warning | 0.31 in. wc below setpoint. Fan near full speed: no headroom left. |
| Mixed air | Unreliable | Sensor reads 212 °F, outside its physical range. Named, and left out of every check that uses it. |
| Filter | Info | Pressure drop 1.1 in. wc: schedule a change. |
| Economizer | Info | Unavailable: needs an outside air temperature, which this unit does not have. |
| Supply fan | OK | Proven, near full speed. |
| Coils | OK | No heating and cooling at the same time. |
| CO2 | OK | Return air 640 ppm. |
| Safeties | OK | Freeze stat, smoke detector and high-static switch normal. |
What it checks
Detect works from the points your building automation system already has: commands, status, setpoints, temperatures, pressures and valve positions. Each kind of equipment has its own set of checks, and each check names the likely cause instead of just raising a flag. Some of what it looks for:
Checks for other kinds of equipment are built the same way and added as a building needs them.
Score and history
Every unit carries a score from 0 to 100 that its own checks set. A critical finding takes more off than a warning, a check waiting on a sensor barely counts, and how much each check matters can be tuned.
The score is recorded every hour beside the readings the checks use, so the history shows when a unit started to slide, what its fan and valves were doing at the time, and whether a repair brought it back.
Tuned per unit
| Setting | Value | Edit |
|---|---|---|
| Fan proof delay | 60 s | Edit |
| Discharge air warning band | ±7 °FTuned. Default ±5 °F | Edit |
| Discharge air warning after | 15 min | Edit |
| Discharge air critical band | ±10 °F | Edit |
| Duct static warning band | 0.25 in. wc | Edit |
| Duct static warning after | 20 minTuned. Default 10 min | Edit |
| Filter change at | 1.0 in. wc | Edit |
| Return CO2 warning | 1,000 ppm | Edit |
In your building system
Each unit’s status is published on your network as a BACnet point: OK, warning or critical. The building automation system your team already uses can put it on its graphics and alarm on it, so a fault Detect finds reaches the operator’s screen with nothing new to log into.
| Point | Value | Updated |
|---|---|---|
| AHU-12 Detect status | CRITICAL | 2 s ago |
| AHU-38 Detect status | WARNING | 2 s ago |
| AHU-07 Detect status | OK | 3 s ago |
| VAV-2-14 Detect status | WARNING | 2 s ago |
| Chiller 1 Detect status | OK | 4 s ago |
The operators’ own graphics and alarms read these points. Nothing new to log into.
Where findings go
Runs on site
Detect runs on a small server in your building, next to your building automation system, and reads it over BACnet. Detection keeps running if the internet connection drops. Nothing is ripped out or replaced.
Detect and Insight
Detect finds and names faults on site, around the clock. Insight ranks them across the building, explains them in plain language, and writes the morning briefing and the reports your team and owners read.
Customer story
The Biltmore Hotel in Coral Gables has run its plant for a century. Since spring 2026 the engineering team has opened each morning with a Smart Tenants briefing: the conditions that need attention, ranked, with the first check written out, drawn from the building automation system the hotel already had.
Read the customer storyTell us about your building systems and we will show you what a morning briefing would say.