AHU Supply Air Temperature Won’t Reach Setpoint? What to Check First
AHU supply air temperature not meeting setpoint? Check sensor accuracy, active setpoint, valves, airflow, water temperatures, dampers, and BAS sequence.
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Commercial Boiler Short Cycling: What to Check Before Blaming the Boiler
Commercial boiler short cycling can come from low load, low water volume, flow problems, staging, sensors, or controls. Use this BAS-first diagnostic workflow.
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Fan Coil Unit Fan Not Running? How to Separate a Motor, Relay, and BAS Controller Fault
A commercial fan coil unit fan is not running? Check BAS logic, output type, relays, wiring, power, and the motor before replacing expensive components.
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Commercial HVAC Compressor Won’t Start: How to Separate a BAS Command Problem from a Control Board or Safety Fault
A commercial HVAC compressor won’t start even though the BAS shows cooling demand? Trace the command, safeties, controller, contactor, and power before replacing parts.
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RTU Economizer Not Working? How to Diagnose Sensors, Dampers, and Control Logic
RTU economizer not working? Check outdoor-air sensors, control logic, damper actuators, BAS commands, ventilation requirements, and mechanical cooling before replacing components.
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VAV Box Not Cooling? What to Check Before Replacing the Controller
VAV box not cooling the zone? Check airflow, damper operation, duct static pressure, BAS overrides, sensors, and reheat before replacing the controller.
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AHU Preventive Maintenance Checklist: Filters, Coils, Fans, Dampers, Sensors, and Controls
Use this AHU preventive maintenance checklist for filters, coils, condensate, fans, VFDs, dampers, valves, sensors, safeties, and BAS controls.
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Commercial RTU Preventive Maintenance: What to Check Before the Next Heat Wave
Prepare commercial RTUs for hot weather by checking filters, coils, condensate, fans, economizers, sensors, controls, schedules, and BAS trends.
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Commercial Chiller Maintenance: What to Check Before Cooling Season
Prepare a commercial chiller for cooling season by checking alarm history, water flow, pumps, heat rejection, controls, sensors, and BAS trends.
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AHU Static Pressure Alarm Keeps Coming Back? What to Check First
A recurring AHU static pressure alarm may come from sensors, VAV boxes, dampers, VFD control, or airflow restrictions. Use this field checklist.
