When a Raypak boiler is powered and seemingly running but the home stays cold, the fault is usually somewhere in ignition, circulation, or the control logic rather than the unit being finished.
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Quick answer
A Raypak boiler that is not producing heat is most often dealing with an ignition fault, a circulator that is not moving water through the system, a thermostat or zone control that is not calling for heat correctly, low system pressure, or a safety lockout carried over from an earlier fault. Because the control system runs through a sequence of safety checks before allowing the burner to fire, a single failed component anywhere in that chain can stop heat production even while the unit otherwise appears normal. A licensed gas fitter works through that sequence methodically to isolate the actual cause.
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No heat covers several genuinely different underlying problems, so the first useful distinction is whether the boiler is firing at all, attempting to fire and failing, or firing normally while the heat fails to reach the radiators or hot water loop. A silent, unresponsive unit points more toward power, gas supply, or a lockout condition. A unit that attempts ignition and then stops points toward the ignition or flame-sensing chain. A unit that runs steadily while the home stays cold points toward circulation rather than combustion.
Noting which of these patterns matches what you are seeing, and roughly how long it has been happening, gives your technician a meaningful head start before they even arrive.
A systematic diagnosis starts by confirming gas supply and electrical power are reaching the unit, then reviews the control board's fault history rather than guessing. From there, system pressure is checked against the gauge, the circulator is inspected for movement, and the thermostat or zone controls are verified to actually be issuing a call for heat. Ignition components, including the igniter and flame sensor, are tested directly, since a unit that powers on normally can still have a failed ignition component that only shows up when it is actually asked to fire.
| What you notice | Likely direction | Safe action |
|---|---|---|
| No sound from the unit at all | Power, gas supply, or lockout | Confirm nearby breakers and gas shutoff valves are in their normal position; do not force a valve |
| Attempted ignition sounds followed by silence | Ignition or flame-sensing fault | Avoid repeated manual resets; call for service |
| Boiler runs steadily but radiators stay cold | Circulation issue or trapped air | Note which areas are affected and whether it is the whole house or one zone |
| Pressure gauge reading well below normal | Low system pressure | Mention the reading; avoid repeatedly topping up without knowing the cause |
Most no-heat calls resolve with a targeted repair to a sensor, igniter, circulator, or a cleared vent obstruction. Replacement becomes the more sensible conversation when faults recur across different components, when the unit is old enough that further investment is questionable, or when parts availability makes repeated repairs impractical. As a rough planning figure, boiler replacement in Metro Vancouver runs roughly $7,500 to $15,000 or more depending on the system, and that is a ballpark, not a quote; a new installation including piping or venting changes tends toward the $6,500 to $14,000 or more range.
Safety note
Any diagnosis or repair on a gas-fired boiler must be carried out by a Technical Safety BC licensed gas fitter, since the combustion, venting, and control systems are all connected. If you ever smell gas, hear a hissing sound near a gas line, or notice soot or a burning odour near the unit, leave the home immediately and call FortisBC at 1-800-663-9911 from a safe location.
This pattern usually points to a circulation problem, such as a failed pump or trapped air in the system, rather than an ignition fault, since the burner is clearly firing but the heat is not reaching the radiators or loop.
Yes. Many boilers include a low-pressure safety switch that prevents firing below a set threshold, since running the heat exchanger without adequate water risks damage. Restoring correct pressure typically resolves this once the cause of the loss is found.
A single reset is reasonable to try. Repeated resets without understanding why the unit locked out can mask a real safety fault, so if it does not hold after one attempt, call a licensed technician.
Many no-heat faults are diagnosed and repaired in a single visit once the technician identifies which stage of the ignition or circulation chain has failed, though parts availability can occasionally extend the timeline.
It can. A marginal circulator or a partially restricted vent that was tolerable in mild weather may fail outright during a Metro Vancouver cold snap when the system runs harder and more continuously.
It depends on the specific fault and the unit's overall condition and repair history. A technician can compare the repair against the replacement ballpark so you can decide with real numbers rather than guessing.
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