Boiler Combustion Issues
Boiler combustion issues are among the most serious faults you can encounter. A properly burning boiler produces a clean blue flame with minimal emissions. When combustion goes wrong — producing a yellow flame, soot deposits, or incomplete burning — your boiler operates unsafely and inefficiently, potentially producing carbon monoxide.
Combustion problems require immediate professional attention by a licensed gas fitter. Our TSSA/BC-certified technicians use combustion analysers to measure CO, CO2, and excess air, diagnosing whether the issue is a gas valve problem, burner blockage, ventilation issue, or flue obstruction.
Signs of Boiler Combustion Problems
Poor combustion typically shows up as a yellow or flickering flame (instead of crisp blue), soot or black marks around the boiler casing, unusual smells, or high carbon monoxide readings on a detector. Your boiler may also sound different — a roaring or popping noise often indicates delayed ignition from a clogged burner.
Our Combustion Diagnostic Process
We perform a flue gas analysis using a calibrated combustion analyser, measuring CO, CO2, excess air, and flue temperature. We inspect the burner assembly, gas valve calibration, air intake and flue pathways. Once diagnosed, we provide a fixed quote and complete repairs with genuine parts, then verify safe combustion before leaving.
This is not a DIY repair
Combi boilers are gas-fired appliances regulated under the BC Safety Standards Act. Opening the unit, touching the gas valve, or working on the flue without a valid BC gas-fitter licence is both unsafe and illegal. Diagnosing the fault is helpful — fixing it should always be left to a certified technician.
Call 778-909-5731Frequently Asked Questions
Talk to a Licensed Combi Boiler Specialist
Free, no-obligation quotes across Greater Vancouver. CombiBoiler.ca — A division of ROMA Heating Ltd..