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Pilot light and burner light and stay lite for approximately 15 sec. and then main gas valve closes. Why?

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Flame sensor not sensing pilot so doesn't allow main gas valve to open , clean or replace flame sensor and make sure positioned properly.

Posted on Nov 19, 2013

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Richmond gas hot water heater. After I light pilot and main burner why does it flame out in 15 seconds?


If you had to light the main burner manually, something is wrong. Once you light the pilot and it stays lit, the flame heats the thermocouple to open the gas valve and fire the main burner. Either or both of the components you replaced could be defective.

Sep 10, 2015 | Water Water Heaters

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How do I lite the oven pilot


If it's an older model with a true pilot light you turn on the gas at supply line valve, open oven door, remove bottom panel to access pilot and burner. Sometimes it's easier to remove broiler drawer on these models but regardless take a lighter and light pilot. Most models are electronic ignitions which if you have it probably needs replaced if it doesn't ignite the burner in under a minute or minute and 15 secs. It could also be a bad thermostat if the burner ignites within the time period described above

Sep 10, 2014 | Magic Chef Ovens

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How do I clean or replace the pilot generator on a Jandy Lite 2 pool heater? The pilot will stay lit but the main burners will not come on. Jumpering the gas valve will ignite the main burners and the


if the pilot stays lit and main burners wont fire you don't need to replace the pilot generator! you have an open safety, poor electrical connection or a problem within the tstat controls

Aug 19, 2014 | Pool & Spa

1 Answer

When the heat cycle calls for gas there is no ignition is my gas valve bad?


I don't know what kind of furnace you have. But most furnaces have some sort of pilot first than after it is proven than the main gas will come on. Either a standing Pilot with a thermocouple. A hot surface ignition or Spark ignition with a flame sensor. Or a direct fire system where hot surface or spark ignitor start first than all the burners send a 1 sec blast of gas which is proven by the flame sensor if it proves the gas valve stays on.....
In what you have said you have 24 volts to the gas valve and it has not lite. then does the gas valve have a pilot tube???Does it have a thermocouple?? Do you smell gas?? If you don't smell gas then the main part of the valve has not opened. The Pilot valve has to open first and prove before the main gas will come on. I hope this helps. If you still need help repost with the name and model # of the furnace.

Nov 18, 2013 | Honeywell Furnace Gas Valve Sv9501h2409

2 Answers

Why does pilot light turns on gas burner only to have it go out about 10 seconds later? 30 to 40 sec later repeats,without lighting. What is problem? once in awhile, it will light..not often. The burner...


Hello
Sounds like the thermocouple is going bad.The thermocouple is a thin tube that runs from the pilot lite to the gas valve.
What it does is it sences the heat from the pilot lite and keeps the gas valve open to allow the pilot to stay on.
This can be easily repaird by shutting off power and gas to your heater and removeing the thermocouple from the gas valve,then unclip or unscrew it from the pilot lite area.
Any plumbing supply store or home depot or lowes should have these.

Once you get a new one,install to gas valve and pilot lite area then turn on power and gas to heater and follow pilot lighting procedure,you may need to hold gas on for 60 seconds.

Here is a picture of the thermocouple so you know what to look for.


http://thermocatalytic.com/Thermocouple.JPG
http://homerepairgeek.com/wp-content/uploads/2010/12/furnace-thermocouple.jpg

Feb 10, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

Pilot hard to lite when lites stays on about 15 minutes goes out this is on reliance gas hot water heater 101


The thermocouple has gone bad or in this case is going bad to the point that it is useless.

The thermocouple is the pilot's, well, co-pilot! It is the electronic device that senses if the pilot flame is hot enough to ignite natural gas or propane fuel to 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. Neat huh?

Feb 04, 2011 | RTO W4 A.O Smith Gas Hot Water Heater...

1 Answer

Rheem/GE power vent water heater, pilot lites, but not the main


I would check to see if the switch on the blower pressure sensor is closing...When T-stat calls for flame, the circuit starts the blower, then the blower pressure sensor switch closes to allow the main gas valve to be powered.

Jul 08, 2009 | Water Heaters

2 Answers

Laars Lite 2 Gas-Pilot stays on, but main burner shuts off 10 min


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.

Jun 22, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

1 Answer

Main burner will not light. pilot has now gone out


shut off the gas at the gas **** and gas valve. the pilot tube is held in place by a 7/16 compression nut. remove it then remove the 2 screws for the thermopile "generator". follow the pilot tube and the pilot assembly should be held in by one or two screws. usually you don't have to remove the main burners. hopefully this helps

Jun 14, 2009 | Lite On Laars Lite 2 Heaters: 250,000BTU...

2 Answers

Laars lite 2 pool heater burner not lite


If the pilot flame is not strong enough, it will not tell the gas valve to open, or if the gas valve is not getting the signal to open, it won't. Check all wire connections at the thermostat and gas valve. Check ground wires. Clean the pilot light and flame rod.

Aug 31, 2008 | Lite On Laars Lite 2 Heaters: 250,000BTU...

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