E13 means the heater failed to ignite. This could be because of the igniter, the circuit board, a fuel or fuel pump problem, the flame rod being dirty or grounded, The air pressure switch or an overheat occurred. First check the igniter. You can measure the resistance of the igniter with an ohmmeter, it should be somewhere around 16.8 ohms. If you hear a loud ticking or thumping sound before you get the code then you have a fuel flow problem. This can be because of the filter at your barrel or the strainer in the fuel sump or an air bubble in the fuel line. A dirty flame rod can be cleaned with some steelwool or fine grit sandpaper. Unplug the heater before cleaning the flame rod. If the fuel pump ran before you got the error code then the air pressure switch is ok because the fuel pump will not run if the airpressure switch contacts are not closed.
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E13 means the heater failed to ignite. This could be because of the igniter, the circuit board, a fuel or fuel pump problem, the flame rod being dirty or grounded, The air pressure switch or an overheat occurred. First check the igniter. You can measure the resistance of the igniter with an ohmmeter, it should be somewhere around 16.8 ohms. If you hear a loud ticking or thumping sound before you get the code then you have a fuel flow problem. This can be because of the filter at your barrel or the strainer in the fuel sump or an air bubble in the fuel line. A dirty flame rod can be cleaned with some steelwool or fine grit sandpaper. Unplug the heater before cleaning the flame rod. If the fuel pump ran before you got the error code then the air pressure switch is ok because the fuel pump will not run if the airpressure switch contacts are not closed.