When one part of the house stays cold while the rest heats fine, a stuck zone valve is one of the first things worth checking.
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Quick answer
Replacing a zone valve on a West Vancouver multi-zone boiler system typically runs $300 to $650, plus $90 to $150 for a diagnostic visit if it's booked separately. These are 2026 public-market ballparks, not a fixed quote — CANRO's certified gas technicians confirm the exact price once they've tested the valve's motor and confirmed whether it, or the zone control wiring feeding it, is actually at fault. A single stuck zone valve is one of the more recognizable multi-zone heating complaints.
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On a multi-zone hydronic system, each heating zone typically has its own motorized zone valve controlling whether hot water flows to that area, opening when the zone's thermostat calls for heat and closing once satisfied. This lets different parts of a home, upper floors versus main level, or a primary residence versus a laneway or suite, run on independent heating schedules from a single boiler.
When a zone valve fails, it typically fails in one of two ways: stuck closed, so that zone gets no heat at all, or stuck open, so that zone keeps receiving heat regardless of what its thermostat wants.
The valve itself is a moderately priced part, and most of the labour goes into confirming the actual fault before replacing anything, since zone control wiring or the thermostat itself can sometimes cause similar symptoms. Once the valve is confirmed at fault, the physical swap is usually contained if isolation valves allow it without draining the whole loop.
| Item | Typical range (CAD) | Notes |
|---|---|---|
| Diagnostic / service call | $90 – $150 | Confirms valve versus wiring or thermostat fault |
| Zone valve replacement | $300 – $650 | Per valve; multiple valves add proportionally |
| Licensed gas/HVAC labour | $95 – $165 per hour | Includes purging air if the loop was opened |
A single confirmed valve fault with good access and isolation valves nearby sits at the lower end. Costs rise if more than one valve needs replacing at the same time, if the zone panel wiring is dated and needs partial rework, or if the loop needs a fuller drain-down because isolation valves aren't conveniently placed near the affected zone.
Multi-zone setups are common on larger West Vancouver properties, particularly those with a laneway suite or a distinct upper-floor zone, and correctly isolating which valve is actually causing the problem matters more in a system with several zones than in a simple single-zone home.
A single failed zone valve is a routine, contained repair. It's worth a broader look if several valves are failing in short succession, which can point to an aging zone control panel or wiring issue affecting the whole system rather than one isolated valve, and a technician can help determine whether the underlying control system needs attention as well.
Safety note
Zone valves are wired into and plumbed onto a system connected to a gas-fired boiler, and any drain-down work happens near active gas and venting components. This should be done by a Technical Safety BC licensed gas fitter — CANRO holds gas licence LGA0043870 and boiler licence LBP0046450. If you ever smell gas near the boiler, leave the home and call FortisBC at 1-800-663-9911.
In West Vancouver, expect $300 to $650 per valve, plus a $90 to $150 diagnostic visit if it's a separate call. Multiple valves needing replacement add to the total proportionally.
A stuck zone valve is a common cause when the boiler is firing normally but one specific area isn't receiving heat. A technician can confirm this by testing the valve directly.
Yes — a faulty thermostat or a wiring issue between the thermostat and the zone valve can cause similar symptoms. Diagnosis before replacement avoids paying for a part that isn't actually the problem.
No, valves can be replaced individually as they fail. There's no need to replace working valves just because one has failed elsewhere in the system.
A single zone valve replacement generally doesn't affect other zones' operation, though the loop may need brief draining and air purging depending on where isolation valves are located.
There's no fixed lifespan; many operate for years without issue, while the motor mechanism inside can wear out sooner in systems with very frequent cycling.
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