Once adequate blower airflow is confirmed and the switch still will not close its contact, replacement is the straightforward next step.
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Quick answer
A water heater pressure switch is replaced once a technician confirms the blower is producing adequate airflow and the switch itself is still not closing its contact, or once a multimeter test shows it is not responding at the correct threshold. This is a small, inexpensive part, so the cost is driven mostly by diagnostic time to rule out the blower and venting first, plus general access to the unit. A licensed technician provides a firm number after confirming the fault.
Need a licensed gas fitter for your tank water heater? Call CANRO at (604) 359-1081 — residential natural-gas heating and hot water across Metro Vancouver since 1999.
None of the approved whole-system cost ranges apply to this small part. Cost for a gas storage tank water heater depends on size, vent type, and access, and is quoted after a short assessment; a pressure switch swap is a minor repair within that broader scope. Ask your technician for a firm number once the fault is confirmed.
Power-vent and direct-vent water heaters are common throughout Metro Vancouver's condos and townhomes, and damp mechanical rooms in these buildings can accelerate corrosion on small electrical contacts like those inside a pressure switch. A technician diagnosing a fault in this kind of installation will typically check the general humidity and condensation drainage around the unit as part of a thorough visit.
Units tucked into a below-grade mechanical closet, common in older Vancouver-area basements, tend to see more ambient moisture over the winter months than a unit mounted in a well-ventilated garage, and this can shorten the service life of a pressure switch's internal contacts. If a switch has failed more than once on the same unit, it is worth asking a technician to look at overall moisture control in the mechanical space rather than treating each failure as an isolated event.
Safety note
The pressure switch is a safety interlock on a natural gas water heater's venting system and should be replaced by a Technical Safety BC licensed gas fitter; CANRO holds gas licence LGA0043870 and boiler licence LBP0046450. If you ever smell gas near the water heater, leave the home immediately and call FortisBC at 1-800-663-9911 before doing anything else.
Often the real issue is a weak blower or a restricted vent, so a technician rules those out first before replacing the switch, which is why proper diagnosis matters before ordering a part.
Once the fault is correctly diagnosed, the switch itself is usually a short, same-visit replacement of well under an hour.
Yes, briefly, while the unit is powered down and the switch is accessed and replaced.
Yes, if the tube itself is the problem rather than the switch, clearing or replacing just the tube can resolve the fault at lower cost.
It typically means no hot water until resolved, so most homeowners schedule it promptly, though there is no immediate safety emergency if the unit simply will not fire.
Yes, corroded contacts inside the switch can cause an intermittent fault that takes more diagnostic time to isolate than a clean, complete failure.
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