I have a reddy wall heater The pilot light goes on but has a foot and a half flame that wont go down ive blown out all the lines could you please help

check the tank for any blockage and check outlet pipe .

If it's not the thermocouple, then the control valve might have failed. There isn't much else that can cause this.

Hold down the pilot light button for about a minute and a half to generate the milivolts needed to prove a flame, or try sanding down the flame sensor, it could be dirty

The air pump pressure could be off a little causing incorrect fuel delivery. Follow this link for instructions.

OR

The nozzle could be worn to a point where a spray is being produced rather than a fog. By removing the top lid you are changing the aerodynamics and the safety system likes the color of the flame (falsely). Replace the nozzle. Follow this link.

I'm having the same exact problem... At first we thought was the vent... but the way the flames goes out... it seems that there is "not enough oxygen" more than "blown out by the wind"... right after both main & pilot goes out, I can't even light any external flame inside the chamber... and it doesn't feel like the outside cold air coming in... it just feel like there is some sort of gas in the chamber that's so strong, it prevents flame... and the only thing I can think of is that it doesn't have enough oxygen, but too much natural gas, and flame can't sustain.

You will need to change the thermocouple. It is the copper probe that goes from gas valve to flame. Any good farm store should have one.

THE flame from the pilot should shoot past the thermo-couple and heat this up and make a small amount of mili- amps to prove the pilot light is lit. ..So if the flame doesn,t go past the thermo-couple it won, make mili-amps or its tme to change out the thermo-couple, They only cost lest than $8:00 and you can change it!

Generally speaking a propane heater stays lite because the pilot stays lite. The pilot flame touches a thermocouple which produces a current which keeps the main valve open. Pilot goes out or you have a bad thermocouple or the pilot is slightly clogged (reduced heat to thermocouple) or maybe the thermocouple is not touching the flame enough. Most times when a propane heater goes out the problem is somewhere in that neighborhood. Thermocouple - pilot. I have always had luck carefully taking those parts off, cleaning, and reassembling, but check the position of the thermocouple first. Looks like a small brass rod which sticks into the flame. This is a safety mechanism to prevent the flame being blown out and leaving the gas on. Good luck

I have a Reddyheat IWH16NLTD with this problem. When the heater fan turns on it blows the pilot light slightly up and away from the thermocouple causing the safety valve to close after the ceramic cools down. The manual says that low gas line pressure can cause the flame to rise too far from the thermocouple causing this problem, so either it is a problem with gas pressure, or it is an assembly plant problem.

A short pilot flame not playing on the thermocouple or a faulty thermocouple , loose connection at the gas where thermocouple is ,

blocked pilot flame to small , air in gas line did he purge the gas line first? other wise you will be there a long time .