Field note
Before clearing a drain, determine whether the water is actually coming from the drain system. Sweating, icing melt, a cracked pan, or a roof/building leak can look similar.
Identify the source
- Inspect the primary pan, secondary pan, drain outlet, pump, trap, fittings, insulation, cabinet seams, and nearby building surfaces.
- Look for ice on the coil or suction line that could melt after shutdown.
- Check cold drain tubing and piping for missing insulation/sweating.
- Do not assume water above a ceiling is HVAC condensate until the source is traced.
If it is a drain restriction
- Vacuum/clear the pan and drain line and remove sludge at the source.
- Verify trap and vent arrangement are correct for the equipment pressure relationship.
- Test the condensate pump and float/overflow safety if installed.
- Pour-test or otherwise introduce water to prove positive drainage before leaving.
If the pan is damaged
A temporary seal may be appropriate only when allowed and when water cannot create a safety/building risk. Document that a cracked or corroded primary pan is a mechanical defect and recommend permanent repair or replacement.
Monitor after the fix
- Run long enough for condensate to form.
- Reinspect the pan, fittings, pump, and ceiling/occupied space.
- Tell the site exactly what was corrected and what condition still needs monitoring.
Safety / model checks
- Shut equipment down if water threatens electrical components or the building.
- Use approved drain-treatment chemicals and protect occupied areas from spills.
Safety note
HVAC work can involve high voltage, rotating equipment, pressurized refrigerants, and combustion systems. Use this site as a reference only. Follow the equipment manual, applicable codes, PPE, lockout/tagout, and current refrigerant rules. Field cases and troubleshooting paths are case-specific and are not OEM procedures or universal targets.