Start here when the instrument reading, building condition or system behavior does not match expectations. Troubleshooting requires separating an observed symptom from a verified cause. A high reading, a cold pattern or an unexpected pressure drop may have more than one explanation.
A practical diagnostic sequence
- Describe the symptom: what changed, when it appears, and what operating state was present?
- Verify the measurement: check instrument suitability, units, setup, calibration or verification status, location and stabilization time.
- Compare conditions: record baseline and problem-state readings under comparable conditions.
- Isolate likely causes: distinguish the measured evidence from assumptions and test the safest, most likely explanations first.
- Confirm the correction: repeat the same measurement after a change and preserve a record of what was adjusted.
Common troubleshooting themes
Our guides address airflow and ventilation disagreements, combustion readings, refrigerant system measurements, infrared temperature uncertainty, humidity and condensation, compressed-air demand and temperature logger inconsistencies.
Published troubleshooting guides
- testo 770-1: Electrical Measurement Setup and Safe Use : Why the 770-1 is not the
- Why Does Vacuum Rise After Pump Isolation? Causes and Test Tips
- Why Does Pulling a Vacuum Take Longer Than Expected? Causes and Checks
- Why Does CO2 Rise Quickly in a Meeting Room? Causes and Ventilation Checks
- Why Do Two CO2 Meters Give Different Readings? How to Compare Them
- Why One Air Velocity Reading Isn’t Enough for Duct Flow—and How Traverses Help
- Why Infrared and Probe Thermometers Give Different Food Temperatures
- Why IR Reflective Tape Distorts Temperature Readings: Emissivity and Spot Size
- Why Condensation Forms on One Wall but Not Another: Dew Point and Surface Temperature
- Why Does Compressed Air Consumption Stay High During Production Stops? Causes and Checks
- Why Do Two Hygrometers Show Different Readings? Causes and Checks
Stop and consult appropriately qualified personnel when testing involves hazardous voltage, gas or combustion products, refrigerant handling, pressure systems or invasive building work.