NTI
Chronic Condensate Drainage Problem
Boiler’s condensate trap repeatedly fills and overflows or trips safety
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Improper trap installation, Insufficient drain slope, Undersized or shared drain line, Negative pressure in drain line
How to Fix / Troubleshooting
Safety: Condensate is mildly acidic; protect surfaces and wear gloves.
- Verify trap orientation: Ensure the NTI condensate trap is installed in the correct orientation and fully seated.
- Check drain routing: Confirm the drain line has continuous downward slope and is not tied into a line with strong negative pressure (e.g., fan‑assisted drain).
- Increase pipe size: If the drain is long or shared, upsizing the pipe may improve flow.
- Add vent: In some cases, adding a vent tee near the trap outlet can prevent siphoning; consult local codes and NTI guidelines.
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Repair Difficulty
Medium
3/5
Required Part
Condensate Trap and Drain Line
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