GOFAR Services, LLC - Appliance Repair Houston, TX - Chapter 5GAS COOKTOPS5-1 NORMAL OPERATIONTemperature is controlled in a surface burner by varying the flow of gas to it with a manual gas valve. Ignition is achieved in one of two ways; either a standing pilot flame or a spark ignition.
Gas shoots out of jets on the side of the burner and into a flame tube, which carries the gas to the ignition source.
Since each burner has its own ignitor, flame tubes are not used in these units. TROUBLESHOOTINGThe most common problems with gas burners is that a pot boils over and stuff clogs the gas flame tube jets.
The burners use a flame tube system as described above, except that in place of the pilots, there are electrodes that spark to ignite the gas. Spark ignition systems use a spark module to generate a pulsing, high-voltage spark to ignite the gas.
These pulses are at very low amperage, measured in milliamps, so the risk of shock is virtually nil.But the voltage is high enough to jump an air gap and ignite gas. When the spark is operating, you hear a tick-tick-tick, 2-4 ticks per second. The spark ignition module (figure 5-C) is usually located inside a metal box under the cooktop surface or inside the back panel of the stove. Either the electrode will not spark, or it will not stop sparking.When troubleshooting cooktop electrodes keep something in mind.
In some cooktops, the electrodes are wired in series; in others, they are wired in parallel. If the electrodes are in series, and one is not sparking, none will spark. Also, all spark electrodes use the same spark module, but different switches.
So if one burner is not igniting, while the gas valve is still open to that burner, try turning on another burner that doesn't share the same ignitor.


In this way you can isolate the problem to the switch (which it is, 99 percent of the time,) the electrode, or the spark module. To confirm your diagnosis, pull the leads from the switch, touch them together and see if the ignitor sparks.
If you get too fast and loose with pulling the leads off to test them, you might zap yourself. Try using two pairs of insulated needlenose pliers to pull the leads off the switch.If the ignitors will not stop sparking, usually one of the ignitor switches has shorted, due to moisture getting into it. To figure out which, pull one lead off each switch, one at a time, until the ticking stops. And over a long long period of time this ash can build up and clog tiny gas orifices, like pilot orifices. The symptoms may be that the pilot will not stay lit, or blows out too easily. There is also a little "cup" around the pilot light in a surface burner to regulate air for proper combustion of the pilot flame. If you choose to clean them out, use a soft-bristle brush like a toothbrush, and not a wire brush.
Be careful not to push the ash into the orifice and impact it.The surface burner jets are a different animal. The problem is, that pot that boils over can leave some pretty crusty stuff on the burners. Sometimes the crusty stuff is not crusty but gummy, and this can be even more fun to get off the burner. There's no magic way to do this. Depending on what's clogging the gas holes, you may be able burn it off, or at least char it so it can be scraped or knocked off.


Use a propane torch or one of the other stove burners if you can get it into the correct position. You may also be able to use alcohol or some other non-petroleum solvent to knock it loose. If you do, make sure the solvent is completely gone before you put the burner back into service. You can use a welding tip cleaner, or a small twist drill, to poke into the holes but only if it fits in the hole with plenty of clearance. Remember, the objective is to take off the crusty stuff without taking off any of the metal. So if one burner is not igniting, while the gas valve is still open to that burner, try turning on another burner that doesn't share the same ignitor. Depending on what's clogging the gas holes, you may be able burn it off, or at least char it so it can be scraped or knocked off.
Sometimes a burner is just too badly clogged, or the holes are too small, and the burner must be replaced.?Copyright 2011 GOFAR Services, LLC.



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