Question about Coleman Propane Forced Air Heater w/Electronic Ignition (50,000-80,000 BTU)

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Heater will light but when gas is injected stays lit for 5 seconds then goes out

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I would start with the flame sensing rod. There is a small metal rod approx 2 inches long with the diameter of a wire coat hanger.It has one wire attached to it which goes to the gas control board. It is mounted in front of one of the burners (often the burner furthest from the ignitor). This sensor sometimes develops a light coating that works like an insulator which will prevent it from sending the proper signal to the board to allow the gas valve to remain lit. In this case, the solution is simple: take a scotchbrite pad and lightly rub the flame sensing rod. This will remove the coating and allow for a proper signal to the board. Take care not to break the ceramic insulator, dislodge one of the burners, or to mistake the Hot Surface Ignitor for the flame sensing rod. The Hot Surface ignitor is the part that glows red and ignites the gas when the valve opens. It is extremely delicate. It has two wires (not one) and looks nothing like a single rod as I described the flame sensor. However, it too is mounted in front of a burner.
I hope you find this helpful. Good Luck! :-)

Posted on Feb 07, 2010

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