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Zone not conditioning — overall procedure
What is going on
Possible causes and checks for: zone not conditioning — overall procedure.
Likely causes
- Set all stats to Fan-On (or 10°F past set point)
- Verify airflow at every register (dampers open)
- Then turn stats off one at a time, confirm airflow stops (damper closed), leaving one zone open while testing the last
- Watch the barometric bypass arm move as zones close (nearly open with one zone, closed with all open). pp.1000–1002 [974–976]
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Source: General HVAC service practice — verify per model. Written in our own words; check the manual for your exact model.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.