What's in a BMS audit (and why pre-inspection audits matter)

We do a lot of pre-inspection BMS audits. Most failures come down to a few recurring issues: drifted sensors, missing documentation, and one or two components that should have been replaced last service cycle. Here's how we structure an audit, and what we'd recommend you check yourself before your next inspection.

What gets reviewed

• Alarm history. Pull the alarm log from the BMS. Recurring lockouts on the same fault code are usually a symptom that needs root-cause work, not just a reset.
• Sensor calibration. Thermocouples drift. Flame rods foul. Pressure switches stick. Spot-check each against a reference and document the readings.
• Wiring inspection. Bad terminations are the #1 cause of intermittent BMS faults in our experience. Pull every cover, retorque every terminal, look for corrosion.
• Fuel gas system. Filter age, regulator setting, pressure switch trip points. Make sure the documented values match what the BMS expects.
• Documentation.Most inspection failures we've seen aren't about the equipment — they're missing paperwork. Make sure your service records, sensor calibration certs, and any modifications are documented.

Common findings (ranked by how often we see them)

1. Missing or outdated documentation for the current BMS configuration
2. One or more sensors drifted enough to fail spec but not enough to lock out
3. Loose or corroded terminations in the BMS panel
4. Fuel gas regulator setpoint doesn't match documented value
5. Recurring nuisance alarms with no documented investigation

When to schedule one

A BMS audit takes a few hours per unit. Schedule it 2–4 weeks before a known inspection so there's time to fix anything we find. If you've had unexplained lockouts, audit immediately — alarm history usually tells the story.