A straight answer on what usually goes wrong with a Rinnai RE series tankless water heater in Port Coquitlam and what a repair visit actually involves.
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Quick answer
Most Rinnai RE series repair calls in Port Coquitlam come down to ignition or flame-sensing faults, a clogged inlet water filter, or a flow sensor that's stopped reading correctly -- all of which a licensed gas fitter can usually diagnose in one visit. The RE series is Rinnai's non-condensing tankless line, so it doesn't have the condensate-drain issues a condensing model can get, but it still needs a proper combustion, venting, and gas-pressure check before anyone touches the electronics.
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The RE series makes hot water on demand rather than storing it, which is the defining trait of Rinnai's non-condensing tankless line, and it needs a flue of its own to vent. In Port Coquitlam, we run into these units in both older homes that switched over from a tank at some point and newer builds where a tankless unit was part of the original design.
Non-condensing operation means the exhaust temperature stays high, and that's exactly why the venting material and its clearances need to be right, not approximate. PoCo is on Metro Vancouver's soft treated water like most of the region, so the RE series problems we see here tend to be more about age and use than mineral scale.
The complaints we hear most from Port Coquitlam homeowners are inconsistent hot water temperature, the unit shutting off mid-shower, a delay before hot water arrives that's gotten noticeably longer, or an error light the homeowner can't decode. The usual suspects behind those symptoms: a restricted inlet water filter, a flame or ignition sensor fault, a vent obstruction, or gas supply pressure sitting outside spec.
The older river-flat neighbourhoods near the Fraser and the Coquitlam River are full of 1960s and '70s bungalows that were never built with a wall-hung tankless unit in mind, while the newer streets climbing toward Coquitlam have houses designed around one from the start.
The first pass on any repair call is consistent: gas supply pressure, venting condition and clearance around the flue, the inlet filter screen, then the flame and ignition sensors. That's the branch point -- the exact fault the unit is showing decides where the diagnosis goes from there.
The City of Port Coquitlam issues the gas permit, and in the older bungalow stock the original mechanical closet is often too small or too poorly vented for a straightforward swap, which means the venting path has to be re-planned rather than just reusing what's there.
If the culprit is a component -- igniter, flow sensor, gas valve, control board -- your technician walks you through why before ordering it. When the heat exchanger fails, repair and replacement costs tend to land close together, which is the right moment for a candid conversation about which makes sense.
As a rough 2026 public-market figure -- confirmed as an actual quote only after CANRO's certified technicians assess the unit -- a tankless repair runs $250 to $900, on top of the $90 to $150 diagnostic/service call, credited toward the job. The specific figure depends on the part involved, how easy or hard the unit is to reach, and whether venting work is bundled in.
It doesn't get dramatically colder here than the rest of the Fraser Valley floor, but the river-flat lots can pool cold, damp air overnight, and that's worth knowing if the unit sits low against an exterior wall.
A Technical Safety BC licensed gas fitter is required for any gas line, burner, or venting work on an RE series unit -- getting it wrong here is a genuine safety issue.
What a homeowner in Port Coquitlam can safely do before calling: note exactly what the unit is doing (error light pattern, when it fails, whether it's every use or intermittent), check that the gas isn't shut off at a valve somewhere, and make sure nothing is blocking the exterior vent terminal -- snow, leaves, a bird's nest, or storage boxes pushed too close. Anything further needs a licensed technician, not a homeowner attempt.
Safety note
If you ever smell gas, hear a strong hiss at the unit, or see scorching or soot around the vent terminal, leave the home first and call FortisBC's emergency line at 1-800-663-9911 from outside. Don't try to relight a gas appliance yourself once it has shut itself down on a safety lockout -- that's the unit doing its job, and a licensed gas fitter needs to find out why before it runs again.
The RE series is Rinnai's current non-condensing tankless line, so parts and service support are both actively available -- this isn't a discontinued model situation.
Most straightforward repairs -- a sensor, an igniter, a filter clean -- are done in one visit once the part is on the truck or sourced locally. If the venting needs work too, budget more time for that portion specifically.
You can power-cycle it once to see if the fault clears, but if the same error comes back the unit is telling you something real failed, and repeatedly resetting a gas appliance without diagnosing the cause isn't a safe habit.
Yes, mineral scale is one of the bigger long-term threats to any tankless heat exchanger. Port Coquitlam is mostly on soft treated water, so this matters less here than in a well-water area, but periodic descaling still extends the unit's working life.
If the heat exchanger itself has failed, if the unit is old enough that parts availability is getting difficult, or if you're facing a second major repair within a couple of years, replacement usually works out better than chasing repairs on an aging unit.
For most repairs that don't involve re-piping gas or re-routing venting, a permit isn't triggered, but any work that does change the gas line or vent path needs to go through the local permitting authority before it's signed off.
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