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I am assuming this is a patio heater.
I have extensive experience with gas appliances.
The most common problem with pilot light issues is the thermocouple it is a probe that is directly over the flame , it senses the flame and allows gas to flow, if it senses no flame the gas valve closes. Patio heaters are also quite finicky, sometimes a simple adjustment of the thermocouple will do the trick. Also thorough cleaning of the orifice is necessary at least 1 x a year.
If you're using a 20lb propane tank (Gas Grill Tank), that may be the problem. Turn off the propane tank at the tank valve and disconnect it from the tank. Wait 5 minutes and reattach the heater hose to the tank. Turn the propane tank valve on very,very slowly until it's all the way open. Try lighting your heater now. If the pilot flame height returned to normal, that was the problem.
FYI - The Thermocouple has nothing to do with the length of the pilot flame. It's a safety feature that stops the gas if the pilot flame goes out for any reason.
Hope that solves your problem. Please let me know.
There is no adjustment for a Pilot Flame's Length on a Vent-free Gas Appliance. However, if you're using Natural Gas and it's a Natural Gas Heater, the normal length of the pilot flame is 2 to 2 1/2". If it's a Propane Gas Heater and the pilot flame is as long as previously stated, you probably have a pressure problem from your tank. Contact your Propane provider to have them check the pressure on their tank regulator.
sounds like you have a blocked pilot injector. normally part of the pilot head. if you can remove it , blow it out with compressed air but it must be removed from the pilot head. commonly known as a Pilot restrictor,Pilot spud or Pilot injector
Not enough information to solve the problem correctly but I'll take a guess at it......
This heater requires a 100lb propane tank (approx. 25gal) with 1/2" or larger piping to deliver the correct volume of gas to the heater. If you are using a smaller tank (like a 10gal) or the piping is not the correct size you will not get enough gas to the heater to light the pilot. Also you should have a regulator set at 11" to 14" of water column installed between the tank and the heater. If the tank is connected directly to the heater you may have damaged the internal regulator in the heater.
Dan, Since you just had the tank filled and the heatewr installed a tinty piece of trash could have entered the pilot orfice. Un do the lower floor panel take off the pilot assy. Blow out the small pilot orfice. Blow reverse from normal gas flow to unlodge the debre. Re asemble and light.
If this dosen't work It may be the pilot air intake is too open causing the pilot to blow itself out.If thats the case close off the air adjustment some. It will be located behind where the flame exits the pilot orfice.