HVACopediaAll brands · General troubleshooting
Corroded duct joints
What is going on
Possible causes and checks for: corroded duct joints.
Likely causes
- Aluminum-to-steel contact
Check in this order
- Zinc/magnesium strip between metals
- Avoid dissimilar joints
More general guides
Take it to the job
All guides, error codes and tips work offline in the HVACopedia app.
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.