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Without a pilot flame sensor signal the pilot light will not stay on and the heater won't work. Try Replacing the pilot flame sensor, the pilot flame burns on to it and it connects to the valve. It looks like a wire.
Hello, if the burners light but do not stay on for more than 10 seconds, I would clean the flame sensor. The flame sensor is a metal rod that is on the opposite side of the Igniter, sometimes it gets coated by oxidation and does not sense the burner flame and shuts the Furnace down. To clean to kill power to tje furnace, remove flame sensor and clean with a steel wool, then reinstall and start Furnce back up. If this does not work then most likely the Igniter is too weak to ignite the gas and will have ro be replaced.
When you light the pilot lite you have to hold the button down until it gets the element hot enough to stay lit. If you hold down the button and lite the pilot and let it go right away it will go out. What to do is hold down the button and lite the pilot and continue to hold the buttn down for about 45 seconds to a minute then let it up very slowly and you will see if it is going to go out by the flame getting smaller as you let up on the button. If it does start to get smaller conitnue to hold it again for a few seconds and repeat the process of letting it up slowly. when the control element gets to the right temperature it will stay lit then turn your valve to "ON" and the fire will start up and continue to heat the water.
For the main gas valve to come on several conditions need to be met.
The system must detect a pilot light prior to turning on the main gas valve for systems with a standing pilot light (not sure what your system has) and on systems with auto igniters (spark or ceramic heat glo) the control board must detect a flame present at the main burner a few seconds after the main gas valve turns on.
The other condition that must be met on systems with power exhaust systems is a vacuum/pressure diaghram switch must be made and stay made telling control circuits that vacuum/pressure is present = power exhaust fan is on and working.
From your description it sounds as if you may have a dirty/failing flame detector (thermocouple). Remove it and give it a good scrubbing with a scotch brite pad etc. cleaning off any carbon or corrosion/gunk re-install and try it out, or simply spend $15.00 or so and install a new one to be sure. The thermocouple is the metal thin tube that protrudes into the pilot and/or main burner flame and is connected to the main gas valve by a thin capilliary tube.
To check the vacuum swich on the blower a multi meter across the switch terminals looking for a steady "state change" as the blower runs/stops will work.
Hi the thermocouple is a long copper wire that goes back to the gas valve from the pilot .
i would clean the flame senser first , then check the pressure switch jump this out , then check the fan control or snap disc jump this out see if it runs if you need A THERMOCOUPLE then honeywell universal will do
CHECK YOUR EXHAUST VENT MAKE SURE THAT IT IS NOT PLUGGED OVER HEATING THE UNIT.ALSO IF IT HAS A FLAME SENSE BAR CLEAN IT AND CLEAN ALL SENSOR OFF.AND MAKE SURE ALL WIRE CONNECTIONS ARE PLUGGED IN TIGHT.
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
When a gas applaince goes off it is usually because of a safety precaution. When the unit dies not detect a flame, it will shut off so that it does not fill with gas and cause damage. A flame sensor is a metal toothpick type item that is in the flame area and could be dirty, although it is two months old, this may be another problem.
But if it is charred, you will need to clean it using a soft cloth or even a well used dollar bill. Don't use abrasives, it will take the coating off of the part and cause it to wear faster.
If you are unsure, below is a link to the manufacturers website, you can get the technical information there.