Pilot Light Troubleshooting for Boilers in Metro Vancouver
Understanding how your boiler's pilot light or ignition system works can help you troubleshoot basic problems and know when to call a professional. While modern condensing boilers use electronic ignition systems, many older boilers in Metro Vancouver homes still use standing pilot lights, and even electronic systems can develop ignition issues. CANRO Heating and Cooling provides expert ignition system diagnosis and repair throughout Metro Vancouver. This guide covers pilot light operation, troubleshooting common ignition problems, and safety guidelines.
Standing Pilot Light vs Electronic Ignition
Older boilers typically use a standing pilot light that burns continuously, providing a flame to ignite the main burner when heat is called for. Standing pilot lights consume a small amount of gas continuously but are simple and reliable. Modern condensing boilers use electronic ignition systems, either intermittent pilot (IP) where the pilot lights only when needed, or hot surface ignition (HSI) where a glowing element directly ignites the burner. Electronic systems are more energy-efficient because they do not waste gas on a continuously burning pilot, but they have more components that can fail including igniters, flame sensors, and control boards. Both systems serve the same purpose of safely igniting the main burner, but troubleshooting approaches differ significantly between the two types.
How to Relight a Standing Pilot Light
If your boiler has a standing pilot light and the flame has gone out, you may be able to relight it yourself. Start by locating the gas control valve on the boiler, which typically has three settings: OFF, PILOT, and ON. Turn the valve to OFF and wait at least five minutes for any accumulated gas to dissipate. Turn the valve to PILOT and press down on the valve knob or button to allow gas to flow to the pilot. While holding the knob down, use a long-reach lighter or matches to ignite the pilot flame at the pilot assembly. Continue holding the knob down for about 60 seconds after the pilot lights to allow the thermocouple to heat up and prove the flame. Release the knob. If the pilot stays lit, turn the gas valve to ON. If the pilot goes out when you release the knob, the thermocouple may be faulty and needs replacement.
Common Electronic Ignition Problems
Modern boilers with electronic ignition can develop several common problems. The most frequent issue is ignition failure, where the boiler attempts to ignite but the burner does not light, locking out with an error code after several attempts. This can be caused by a faulty igniter, a dirty flame sensor that cannot detect the flame, a blocked gas orifice, or improper gas pressure. Another common issue is intermittent ignition, where the boiler lights some of the time but fails on other attempts. This often indicates a component that is failing intermittently, such as a flame sensor that needs cleaning or a gas valve that is sticking. A third issue is the boiler lighting but then shutting down shortly after, which typically indicates the flame sensor is not detecting the flame properly, causing the control board to close the gas valve as a safety measure.
When to Call CANRO for Ignition Problems
While relighting a standing pilot is a DIY-friendly task, most other ignition issues require professional diagnosis. Call CANRO at (604) 559-1612 if the pilot will not stay lit after multiple relighting attempts, if your modern boiler displays an ignition failure error code, if you smell gas at any time during your troubleshooting attempts, if your boiler attempts to ignite but sounds unusual or produces an irregular flame, or if the ignition system has been repeatedly failing and requiring resets. Our technicians have manufacturer-specific diagnostic software to read detailed fault information from modern boiler control boards, allowing accurate and efficient diagnosis of ignition problems. Most ignition repairs can be completed during a single visit, restoring your heat quickly.
Safety Reminder
If you smell gas, suspect carbon monoxide or believe there is an immediate danger, leave the property and contact emergency services or the appropriate gas emergency authority. Do not remain inside — exit the building immediately and call for help from outside.