Can't light fire

There is a flow switch if that's not working. same problem needs to be tested Gas valve solinoid could cause this Igniter could cause this problem Gas pressure regulator wrong pressure should be about 2.7KPA LPG Gas valve should be set to about 2.6 KPA LPG

did you try bypassing the cycling t-stat also?

Is the air flow the pressure switch .

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.

Replace the regulator and that should solve it!

i have had a legend vantage slide control gas fire for about 5 years.this problem is i believe a blocked oxy get which is a failsafe device to prevent a gas leak.can be remedied easily by a gas safe engineer.

Regulator is not bad, as I stated before new valves are designed to reduce gas flow if valve is opened to fast. This is so if grill catches on fire, the tank will shut itself off, thus propane will stop flowing causing fire to extinguish itself.

Hi, normally when you turn the gas off at the flex line valve and leave it off for awhile, the gas has to clear the gas valve and lines up to the pilot. Purge its self of air before it will light again. It will take the electronic ignition several clicks and more before there is enough gas to light the pilot and then open the main gas valve to fire the burners. Tell me, what kind of gas furnace is this when you speak of water? you say the site glass was full and you had to drain it and then the ignitor kept on clicking when it normally only took one click to light it. Please let me know the style as in a split system, a package unit, all in one, or what you have. I will wait to hear back from you. If the pilot does not light right away, then yes let it continue to click and see if it will light. On a heater with the electronic ignition control module on it or a circuit board, this is what tells the pilot coil to energize to light the pilot. It will send power to the pilot coil to open and let gas through to light and same for the main gas valve, will get a signal to open when the pilot is on. It will not open unless the pilot is lite for saftey. I will wait for you're responce.
Shastalaker7

Try banging on the tubes feeding the burners with a heavy pair of vice grips or a hammer. It usually shakes the carbon loose to allow for free flow of gas.

check your dryer vent , check to make sure it is not full of lint or crushed. check the outside also make sure there is good air flow coming out.