A straight answer on what usually goes wrong with a Rinnai RE series tankless water heater in Port Moody and what a repair visit actually involves.
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Quick answer
Most Rinnai RE series repair calls in Port Moody 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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Rinnai's non-condensing RE series line works on demand -- water is heated as it passes through, not kept warm in a tank, and the exhaust needs a dedicated vent rather than an old chimney tie-in. In Port Moody, 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.
A hotter exhaust stream is the price of non-condensing operation, which is why the flue material and its clearance from combustibles carry more weight than people assume. Port Moody draws the same soft Metro Vancouver reservoir water as its neighbours, so scale isn't usually the driver behind an RE series repair call here.
The complaints we hear most from Port Moody 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. It's rarely more complicated than one of these: a fouled inlet filter, a misreading flame or ignition sensor, a vent that's partly blocked, or gas pressure that's shifted.
The city wraps around the head of Burrard Inlet with older waterfront-area homes down low and newer construction climbing the slopes toward Heritage Mountain and Anmore, and the grade change alone affects how a vent run has to be laid out.
Whatever the neighbourhood, a repair visit opens the same way -- gas pressure check, venting condition and clearance, inlet filter inspection, then flame and ignition sensor testing. Past that opening check, the direction of the diagnosis depends on the particular fault in front of the technician.
The City of Port Moody handles gas permits, and on the steeper lots a swap sometimes means running new venting at an angle the original installer wouldn't have dealt with, which is a labour factor worth budgeting for.
When a part is genuinely at fault -- igniter, flow sensor, gas valve, control board -- the explanation comes first, then the order goes in. If the heat exchanger is what gave out, repair and replacement pricing usually converge, and it's better to talk that through than default to repairing an aging unit.
In 2026, the public-market ballpark -- not a firm quote until CANRO's certified technicians have had a short assessment -- for a tankless repair runs $250 to $900, plus the $90 to $150 diagnostic/service call, credited toward the repair. Where it falls in that range comes down to the failed component, unit accessibility, and whether the venting needs any attention as well.
Coastal rain is the bigger day-to-day issue here rather than deep cold, but wind-driven rain off the inlet can find its way into a poorly sealed vent terminal faster than people expect.
Anything involving the gas line, burner assembly, or venting on an RE series unit needs a Technical Safety BC licensed gas fitter, full stop -- there's no safe homeowner shortcut.
What a homeowner in Port Moody 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. The rest is squarely a licensed technician's job.
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 Moody 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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