Automated Logic zone sensor
Match the sensor family, display type, thermistor curve, and communication wiring before replacing a sensor out-of-range alarm.
$35-$180
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Automated Logic WebCTRL Fault Codes and BAS Alarms
Automated Logic (Carrier subsidiary) WebCTRL uses BACnet controllers (MCB, LGR, VMA, ZN series) and SiteBuilder software. Alarms display in the WebCTRL Alarm Manager and via e-mail/SMS notification.
If the search is really for an Automated Logic WebCTRL default login or password, use the Automated Logic WebCTRL default login recovery guide before trying to acknowledge alarms. It covers owner verification, dealer recovery, password rotation, and safe BAS access without publishing shared credentials.
| Alarm | Device | Meaning | Quick Fix |
|---|---|---|---|
| Controller Offline | MCB/LGR | Controller not responding | Check power and network |
| Sensor Out of Range | VMA/ZN | Sensor reading exceeds limits | Check sensor and wiring |
| Communication Fault | All | BACnet communication lost | Check MS/TP or BACnet IP |
| Fan Status Alarm | AHU | Fan command/status mismatch | Check fan and status input |
| Discharge Air Fault | AHU | Discharge air out of range | Check coil valves and economizer |
| Freeze Alarm | AHU | Low temperature detected | Check heating coil and OA damper |
| Override Active | Any | Manual override in effect | Clear override via WebCTRL |
| Valve Fault | AHU | Actuator position fault | Check actuator wiring |
| Occupancy Fault | Zone | Occupancy schedule error | Check schedule configuration |
| WebCTRL Server Fault | Server | Server application error | Check service, database, and access recovery |
Most Common Faults
Controller Offline
An ALC controller going offline in WebCTRL typically indicates a network issue or a power problem. Check that the controller is powered (status LED on), then ping the controller’s IP address from the WebCTRL server. BACnet MS/TP trunk faults cause cascading offline alarms for all devices on that trunk.
Sensor Out of Range
ALC controllers accept UI (universal input) configured as thermistor, 0–10V, 4–20mA, or dry contact. A sensor out of range alarm means the raw input is outside the calibrated range. In SiteBuilder, check the input type configuration matches the physical sensor. A broken thermistor wire reads the same as a short and will be outside range.
Freeze Alarm
WebCTRL freeze alarms from AHU applications latch and require acknowledgment plus reset at the controller. The freeze strategy (close OA damper, open HW valve, stop fan or not) is configured per-program. After resolving the freeze condition, reset the alarm in WebCTRL and verify the OA damper returned to controlled position.
WebCTRL Server Fault
WebCTRL runs as a Windows service. If the service crashes or fails to start after an update, check the WebCTRL log files in the install directory before resetting credentials. Common causes include Java heap size too small, SQL database connection failure, a corrupt WebCTRL database, or an expired certificate that looks like a login problem.
WebCTRL Access and Password Safety
Do not put factory or inherited WebCTRL credentials into a live building automation server. If a facility does not have a valid login, use the owner credential record, the installing contractor, or the Automated Logic dealer recovery path. For the full safe recovery workflow, use the WebCTRL default login recovery guide. After access is restored, disable shared accounts, rotate temporary passwords, and confirm remote access is protected before reconnecting the server to a broader network.
If the search started because a technician is locked out during an active fault, keep the troubleshooting work separate from credential recovery. Verify controller power, network reachability, and alarm history with an authorized account instead of trying random default passwords.
Parts Often Needed
| Part | Notes |
|---|---|
| MCB/LGR controller | Match controller family and I/O count |
| VMA VAV controller | Replace only after power and bus checks |
| Zone sensor (ZS) | Match sensor type and thermistor curve |
| Damper actuator | Match torque, signal, and fail-safe action |
| BAS network switch | Check on repeated BACnet/IP dropouts |
Need Replacement Parts?
Before ordering, match the building automation part to the controller family, electrical rating, input/output count, network type, and failure symptom. Check current prices on Amazon - prices and availability change frequently.
When to Call a Pro
WebCTRL server administration, database management, and BACnet network configuration require Automated Logic-certified technicians. An incorrect network change can disable multiple buildings simultaneously.