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Lennox gas 23/100 burns fine for about 30 nin then sounds like all shuts off but flames slowly return to header ports so slow that sets wiring on fire or melts them

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Take it out side and call a gas fitter to examine it

Posted on Dec 03, 2016

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Heater fires and shuts off repeatedly. reads CHF. Has good flow.


error code should be inside heater make shure you have adequate gas pressure also sounds like bad flame sensor when flame sensor doesnt sense flame it will shut off after 7 seconds

Oct 02, 2013 | Raypak Rp2100 Pool & Spa Heater Lonox 407k...

1 Answer

Sirocco eco 3 gas fire. Flames burning ignition cable


Yellow flames is lack of air blocked burner ,blocked injector , low gas pressure .

I would put a smoke pellet up the chimney to see if you have a pull on the chimney to see if it is not blocked , or if you have down draught what sort of pot are you thinking of putting on the top ?

Jun 11, 2012 | Grilling

1 Answer

Igniter goes on blower runs for 30 seconds main heater flame ignites and burns for approx 30 seconds then it shuts down for approx 10 seconds and repeats the same sequence 3 times, then shuts down...


there should be a flame detector sensor. it is in the flame. this will need to be cleaned with a wire brush or scrapped with something to get the carbon build up off of it.
you will see something that in in the flame area that is kind of charred and black with a wire coming out of it.
this is designed to tell the unit that there is a flame present and if that flame is not there after serveral attempts it will shut it down. because it there was no flame there you would get gas fumes pumped into you house.
you could change it out or usually you can just clean it and it will work fine.

hope this helps
rick

Jul 15, 2011 | Kitchen Ranges

1 Answer

When gas is lit on grill flame is very small and then burns out


To solve this problem, first be sure you have adequate gas in the tank. If that checks out OK, do the following:

1. Turn the gas tank valve OFF and disconnect the hose from the tank.

2. Wait 5 minutes and reconnect the hose to the tank.

3. Open the tank valve VERY, VERY SLOWLY (Slow motion, slow).

4. Once the tank valve is fully open, light the burner farthest from the tank first and set the burner
control knob on HIGH. Does the flame height look correct for being set on HIGH? If so, light
the remaining burners the same way. Do all the burner flames look correct? If so, you solved
the problem. Remember, to always open the tank valve Very, Very Slowly.

If the above didn't solve the problem, you will need to replace the grill's Hose/Regulator Assembly. It runs about $30.00 at any home center or hardware store that sells grills & accessories. If you replace it, turn the tank valve ON Very, Very Slowly.

Hope this helped you to troubleshoot and solve the problem. Happy Grilling.

Jul 09, 2011 | Weber Genesis Gold B Premium Grill

1 Answer

I have an endless summer 92000 table top propane heater. Lights fine, but the flame does not burn at the edge of the burner. Instead, it only burns in the very center of the burner... much like a Bunsen...


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.

Apr 30, 2011 | Endless Summer 92000 Table Top Patio...

2 Answers

Lennox hotshot garage heater, ignites for thirty seconds then shuts off for a couple minutes fan runs continous because its -35 celsius outside and with this happening cannot heat garage to set...


Look for a flame sensor located in the flame of one of the burners. It will look like a small rod or probe and will have only 1 wire going to it from circuit board. Polish it with a scrub pad or stiff wire brush. Check the wire for a good connection as well as any ground wires off of the circuit board.

Jan 20, 2011 | Mr. Heater Natural Gas Garage Heater -...

2 Answers

Lennox furnace 17 yeanrs old. flame comes on and the shuts down sometimes right away some times in a few minutes. We have the furnace go down to 58 at night. It takes all day to get back to 67.


Sounds like a dirty flame sensor.
Also 9 degrees is a large swing to recover. Most specialist will advise no more than a 5 degree set back, otherwise recovery time eliminates any savings you may achieve.

Dec 05, 2009 | Dayton (3E407) Heater

1 Answer

I have a problem with my heating system. It is about 10 years old and has had the ignitor, combustion blower motor, and programable thermostat replace in it's lifetime. The system worked great last year....


sounds like its not proofing flame. it has a sensor usually like a needle sticks out into the flame that tells the gas valve the flame lit and is burning so its ok to keep sending gas, if its fails to proof flame then burner shuts down, then it tries to relight 3 times then locks out on fail safe. the blower will sometimes run continually once that occurs to highlight a failed condition. every time you reset it will try again 3 times then shut down. lp gas is very dangerous, even i do not work on it as the gas acts like gasoline and lays around. not like natural gas that disperses well. if you see the flame sensor try gently cleaning it with a little emory cloth. also a loose ground can cause this. check tio be sure any green wires are snug , they actually flow volts to ground through the flame on some to proof, thats why no ground no flame. if that fails then the board is most likely problem. change wire for wire , or get generic replacemant and follow directions exactly. good luck.some ignitors act as a flamre proofer as soon as they are done igniting! rarely do they fail to perform both funtions.

Nov 20, 2008 | Heating & Cooling

2 Answers

Lennox Gas Furnace that turns on and shuts off in minutes


After troubleshooting like mad, I found that the flame sensor (rod that sits within the flame) was fouled with carbon on the surface. I believe this shields the rod from proper heat detection and the sensor reports that there is no flame and to shut off the gas valve to avoid explosion. Once I pulled out the rod and cleaned it with a wire brush, I have no problem whatsoever--fixed.

Nov 10, 2008 | Heating & Cooling

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