Sounds like you may not be getting enough gas up to the main burner. Bugs, such as spiders, love to make homes out of the main supply lines. Does your pilot light burn blue, and strong? If not, it may need to be cleared of the obstruction. Also, when opening the the gas tank valve, are you opening it slowly?
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Actually, it's a gas pressure issue. But, it's fairly easy to solve. First, you need to be sure that your LP Tank has a sufficient amount of gas. If it does, turn the propane tank valve OFF. Disconnect the hose from the tank and wait 5 minutes. Then reconnect the hose to the tank and turn the valve ON VERY, VERY SLOWLY (Slow motion, slow). Once the valve is fully open, light the burner as you normally do and turn the burner flames to HIGH. Has the burner flame returned to normal? If so, you solved the problem. Just remember to always turn the tank valve ON very, very slowly.
If it didn't solve the problem, you will need to replace the heater's hose/regulator assembly. Generally, i's the same type that a gas grill uses. So, it won't be hard to find one.
Hope this helped to troubleshoot and solve your problem. Please let me know.
Hello, Here's a few things to check. When you light the pilot, is it a strong blue pilot flame, a weak blue flame or a lazy yellow flame? Is it heating the thermocouple enough to make it red hot after a few minutes? If the pilot is small blue or lazy yellow flame, it may be dirty and need cleaned. When the burner lights, the weak pilot flame may diminish causing the
thermocouple to cool off enough to shut down the main burner. Clean the dirty pilot orifice by using a can of compressed air with
attached straw. (The same canned air you use to clean computer keyboards) Blow it into the pilot assembly where the pilot flame burns out from and blow thru the air holes on the side, if applicable. You might also check the thermocouple itself to make sure the tip is not partially burn't off. It should be a smooth, rounded tip. Replace the thermocouple if cleaning the pilot orifice doesn't solve the problem. Douglas
The pilot light must remain on, even when the main burner is on, to keep the thermocouple hot. If the thermocouple cools off, the gas flow shuts off. It sounds like something is interrupting the gas flow. If this is an LP heater, try replacing the regulator.
Your thermocoupler seems at fault. The thermocoupler is that probe that sits in the pilot flame. It controls the main fuel valve. Make sure that probe is in the pilot flame, better at the tip of the flame and hold the button down for a minute or so after lighting the pilot. If pilot extinguishes, the coupler is faulty. If pilot stays on the heater should fire up when you let up on the pilot button.. Good luck
The thermocouple is the pilot's, well, co-pilot! It is the electronic device that senses if the pilot flame is hot enough to sustain burning the gas fuel from the burner. If the thermocouple thinks it's safe, then it keeps open the main gas valve located in the pilot assembly. If the thermocouple does not sense enough heat from the pilot flame (such as when the pilot is out), then the thermocouple shuts off the gas valve to the burners. How the Thermocouple Works So what is this thing and how does it work? Well the thermocouple (technically called a thermocouple junction) is a device that contains two metal wires welded at the ends and placed inside a protective metal case. The thermocouple sensor is found at the business end of the pilot flame and is designed to be placed in the hottest part of the flame. The other end is connected to the pilot valve body. As the thermocouple heats up, it produces a small amount of electricity and when it gets hot enough from the pilot, send a signal to open the gas valve by using a solenoid operated by a 24 volt transformer. The thermocouple calls the shots, and by converting heat to an electrical signal, it allows the gas valve to open or close.
Once the gas valve is open, gas is then constantly supplied to the pilot and as required for the gas burners (as called for by the thermostat). If the pilot goes out, then the thermocouple gets cold and produces no electric signal to open the gas valve's solenoid and the gas valve shuts off the gas supply to the pilot and burners