Re: The gas flow is very low to the 3 burners on my grill
Hi - assuming there is no severe kink in your gas hose and there isn't any other obstruction in your gas line, a likely cause is that your regulator is faulty and may need to be replaced. I don't think they are very expensive.
You may want to post your problem on the Jenn-Air section of this forum: http://www.bbqsource-forums.com
I've had good luck getting help there with my grills.
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First, check that all the gas lines and flame bars are clear of any 'things' or bugs. I had a similar problem with a Webber grill and found out my problem was with the gas bottle. The new Overflow Protection Valve required on LP bottles can closed off or severly slow the flow of gas when the bottle is full and the valve is opened quickly. It will let enough gas flow to light the grill but won't let the fire get high enough to heat the grill up. Turn all the valves off on the grill and gas bottle. Open the gas bottle valve slowly then turn on the grill burner and try lighting it. If the flame is still very low try again or you have to let it burn at the low level until the OPV float drops down and the valve doesn't impede the gas flow. The best way to avoid this in the future is to not fill the gas bottle to the top when you have it refilled. Just ask the LP attendent to not fill it all the way.
Yes, I believe a kit is available. If you purchased this Jenn Air grill from Lowe's, it was manufactured by Nexgrill Industries. Not Jenn Air. In any event, Lowe's no longer sells the Jenn-Air line of grills. My very best advice is to contact Nexgrill Customer Service @ 800-913-8999. In addition to the burner orifice parts you'll have to have, you will also need a grill tank Hose/Regulator Assembly.
It could be a couple of things. First you could be low on propane or natural gas depending on what you use. The second thing is that over time the little holes in the burners clog. You can poke them clean with a toothpick. Or if they are rusted you will need new ones which you can find from an appliance parts dealer. If they don't have your part start looking on ebay because your grill is discontinued. Jenn-Air might be able to help you find the parts if you can get in touch with a customer service rep.
I have had the same problem before with same exact grill. The burners get clogged and the gas pressure backs up. I have had this actually split a gas valve and the plastic electronic igniters do not have a chance withe the head. Call nexgrill and get all new burners under warranty. This will solve the problem for a while. The latest burners that I received in Aug 2010 are 1/2 inch shorter and may solve this problem. You may want to buy new gas valves since the excess heat in this area may have damaged the valve. Since 2004, I am on my 5th set of burners, 2nd set of gas valves and 3rd electronic ignitor. May just recycle grill and get a Weber or go with charcoal.
This seems to be a problem for most Jenn-Air users. The burners are defective, rusted or clogged and allowing the flame to "back up." You most likely have a melted electronic ignitor as well as gas valve damage. The new burners that I received this week for my model 720-0061-LP are 1/2 inch shorter than previous versions. Time will tell if this fixed the problem. I would call Nexgrill and get all new burners and inspect the gas valve area for damage. Since 2004, I am on my 5th set of burners, glad they were free since I have a lifetime warranty on my model.