Condensate leaks and blockages on a Triangle Tube boiler are usually about drainage slope, freezing, or a saturated neutralizer, not the boiler failing.
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Quick answer
Condensate problems on a Triangle Tube condensing boiler, including a trap that leaks, a blockage that trips a lockout, or acidic water not being neutralized properly, are most often caused by an incorrectly sloped or partially blocked condensate line, freezing of a pipe run through an unheated space, or a neutralizer that has used up its media. A licensed gas fitter can generally trace and correct these without replacing major components.
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A condensing boiler extracts additional heat from the combustion exhaust by cooling it enough that water vapour inside it condenses back into liquid, which is what makes it more efficient than an older non-condensing design. That condensate is mildly acidic, so it drains through a dedicated line, usually through a neutralizer that raises its pH, before reaching household plumbing.
Because that path depends on gravity and a specific slope, any disruption, a kink, a blockage, or a frozen section, will show up as a leak, a boiler lockout, or both. Triangle Tube wall-hung units are commonly installed in tight mechanical closets, where a condensate line often has to route a longer distance to reach an approved drain, which is worth keeping in mind when tracing a problem.
Leaking at a condensate trap or connection is often a loose or degraded seal, or a trap that was not properly primed with water after installation or maintenance, which can also allow combustion gas to escape into the room rather than out the flue. A blocked line, from sludge, debris, or a kink in flexible pipe, can back up and trigger a lockout tied to a blocked-drain sensor, or simply overflow at the trap.
Freezing is a common cold-weather issue in Metro Vancouver during a cold snap, since a condensate line routed through an exterior wall, an unheated garage, or an uninsulated section can freeze solid, blocking drainage until it thaws. A saturated neutralizer, where the granules have been fully consumed by the acidic condensate, stops effectively raising the pH and needs its media replaced rather than cleaned, and on a unit that also feeds an indirect water heater, a longer average runtime can mean the neutralizer needs attention somewhat sooner.
| Symptom | Likely cause | Note |
|---|---|---|
| Water pooling near boiler base | Trap or fitting leak | Trap may need re-priming or reseating |
| Lockout tied to drainage after a cold snap | Frozen condensate pipe | More common on exterior-routed lines |
| Slow drainage, gurgling | Sludge or debris blockage | Line needs clearing |
| Neutralizer box needs frequent attention | Saturated neutralizer media | Media replacement, not cleaning |
Condensate drainage looks like plumbing, but it sits directly downstream of the combustion and venting system, and a trap that is not correctly primed or a line that has been rerouted incorrectly can affect how combustion gases exit the appliance. Diagnosing whether a lockout is truly a drainage issue versus a sensor or venting fault also requires reading the control board and combustion values rather than guessing from symptoms alone.
Because of that overlap with the gas and venting system, this work needs to be carried out by a Technical Safety BC licensed gas fitter. CANRO holds gas licence LGA0043870 and boiler licence LBP0046450 for this category of work in Metro Vancouver.
Safety note
If you ever smell gas, hear hissing near the unit, or notice soot, a burning smell, or headaches and drowsiness near the appliance, leave the home immediately and call FortisBC at 1-800-663-9911 from a safe location before doing anything else. Any work on gas piping, venting, or combustion components must be carried out by a Technical Safety BC licensed gas fitter.
Condensate is mildly acidic, which is why it is routed through a neutralizer before reaching household plumbing, but it is not a combustion or carbon monoxide hazard on its own. The concern is drainage failure disrupting the venting or triggering a lockout.
A condensate line routed through an exterior wall, crawlspace, or unheated garage can freeze during a cold snap, blocking drainage entirely. Insulating or rerouting that section usually resolves a recurring winter pattern.
A boiler that runs longer or more often to satisfy an indirect tank produces more condensate over time, which can mean the neutralizer media needs replacement somewhat sooner than on a heating-only system.
No. Blocking or bypassing the condensate path can back drainage up into the boiler or affect venting, and it removes the neutralizing step for acidic condensate. Any leak should be diagnosed and repaired properly.
Not usually. Most condensate issues are drainage, slope, freezing, or neutralizer problems that a licensed technician can correct without replacing the boiler itself.
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