Ignition failures in the world of heating and troubleshooting are probably the number one service call experienced by a technician. Ignition failures happen in furnaces, unit heaters, and boilers alike. All problems can be narrowed down to the four items: fuel, air, spark/hot surface ignitor, and proven ignition. If any of these are not in the correct, then ignition will fail. As you can see from the chart below ignition failures can be a lot of things. This chart covers the majority of problems.
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