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Originally Posted by NorthernFarmer
So here is what I have now. On heater that doesn't have fan but fires...fan works..wired it to separate 110 and works. On other heater...I checked for fuel..cracked open line..good fuel...opened igniter box and saw spark jumping...pulled out nozzle and it's pretty wet..screen was clean. Unhooked sensor eye but it still didn't light. Would it be the controller on both heaters?
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The sensor is to detect flame. It disconnects the ignitor when the burner lights.
If the ignitor is sparking but the burner won't light, either the nozzle is dirty and is making an irregular spray patern or the combustion air is incorrectly adjusted. It's usually a case of too much air, rather than not enough.
The main fan starts when the plenum reaches temperature so controller or fan switch may be faulty.
Some of the controls can be affected by outdoor temperature if they are old and weak. Bring the unit indoors and let it warm up if you can. Replacing the controller can solve a lot of problems.