Low Flame from Burners 
A low flame on grill is one of the top grill service issues we come across. Most 20 lb (BBQ) propane tanks are equipped with an OPD (overfill protection device) valve that prevents not only the grill from being overfilled but also from releasing gas if it senses gas trapped in the line or manifold. We find that once the tank is reset, the flame pattern returns to normal. Also, the LP (liquid propane) regulator can go bad as well. 
Do you get an even flame pattern if you manually light your burner? If no, Are your burner holes clear of any soot and debris? If yes, clean out the burner or venturi tubes to be sure there are no spider webs. 
To troubleshoot the LP Tank gas grill low flame issue follow these steps: 
• Be sure the LP tank valve is turned off. 
• All of your grill knobs are in the OFF position. 
• Detach the hose and regulator from the gas tank. 
• Open the hood of the grill. 
• Open all of the control knobs to high for about two to three minutes to allow any gas that may be in the manifold to bleed out. 
• Close your control knobs. 
• Reconnect the hose and regulator to the tank. 
• Crack the tank knob to where it just opens and then slowly turn the knob (this allows the line to re-pressurize). 
• Ignite your grill as instructed by your manufacturers instructions. 
• The grill should heat up as normal. If not, try replacing the hose and regulator. 

My Grill Will Not Light  
There are many reasons why a grill will not light, but the most common reason is the spark generator. If you're having an issue igniting your grill, try to light it manually. If it will ignite manually, there is an issue with the ignition system. 
See if burner can be manually lit with match or lighter. Are the other burners in the grill igniting? Check for any cracks in the ceramic tube or breaks in metal tip as well as be sure to look at the alignment of the metal tip on the electrode to the burner. 
Access the grills electrode igniters by removing the cooking grates and heat shields. The electrode may be housed in a collector box. 
When you press your ignition switch you should hear a rapid clicking (in a battery spark generator) or hard snap (in a piezo style igniter) as well as you should see a spark at the end of the electrode tip. You may need to get a flat head screw driver and place it under the metal tip. 

Low heat generated when the knob is in High Position  
• Check if the problem is isolated to only one burner. If so, clean the burner orifice and burner, clearing ports for any obstruction. 
• Check for any bent or kinked fuel hose. 
• Check if the air shutter is properly adjusted. 
• Check for proper gas supply and pressure. 
• Pre-heat grill for 15 minutes. 
• If using LP gas, check for empty tank. 

Burner blows out  
• Check for any burner defect. (Clogged holes) 
• Make sure the burner is installed correctly (over the orifice) 
• Air to gas ratio needs to be adjusted 
• Check gas supply (Is there plenty of gas in the LP tank) 
• Check if the grill location is by a windy area 
• Check for proper gas supply and pressure. 

Excessive Flare-ups 
• Flare ups can be caused by a variety of reasons. If your grill is experiencing an extensive amount of smoke or flare-ups, this is most likely caused by excess grease in the grill. Check your grills burner and flame disbursement system (flame tamers, heat plates, briquette trays, etc) for any metal failure or soft spots. 
• Periodically clean all the guts in your grill. 
• Check the cooking grids or heat plates for excess grease. Clean or replace if necessary. 
• Check for large holes in the burner or heat plates 
• Too much sauce or fatty meats 

SOURCE: thebbqdepot.com

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