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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.
Hello, So the pilot flame stays lit after you release the pilot button, but goes out when you turn the knob to on. First make sure the pilot flame is a strong blue flame that is actually heating the thermocouple. If it's a lazy yellow flame, then it is dirty and will need to be blown out with a can of air with attached straw (to remove dust, spiderwebs, etc). You also might check the burner and orifice to make sure they are not blocked by a bug nests, etc and clean out as needed.
Make sure the thermocouple tip is not burn't off from the pilot flame. It should be a smooth rounded tip. If it's not, then replace it.
Lastly, make sure you're not turning the propane tank valve on too fast. To check this; disconnect the tank, reconnect it and then turn the valve on very slowly. Hopefully one of these solutions will fix your problem. Have a great weekend! Douglas
No pilot in this unit.
Check the thermocouple and its connections.
The thermocouple is the device that has the copper cable connecting it to the vave unit. It leads up into where the burner can "heat it up". This indicates to the controll valve that the gas is actually burning and keeps the valve open.
A polit generator produces about 750 MV without a load. Under load it will drop to about 200-250 MV. If the system is working don't worry about it. If the system is not working replace the pilot generator and retest. Pilot generators usually go bad slowly.
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
Thermo coupler is held in place with a clamp bracket at the pilot end and a small brass line nut on the other end going into the gas valve.The pilot flame must surround the sensing bu or wrap itself around it Press the pilot button for a few seconds and fire up the pilot flame. Wait a few more minutes and turn the gas vale on for the main burners. If it fires, your set.Good Luck,Ned