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Pilot is on; but burners don't ignite - Ruud UBHC Air Conditioner

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Thermosta or roll out switch needs to be reset.

Posted on Aug 11, 2015

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Posted on Jan 02, 2017

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Gas smell when igniting burner.


Hi Jerry

Warning : Gas systems are generally safe but any gas smell should always be investigated by a certified technician as you can never be too safe.

That being said, let me try to assist you as best I can from my experience with gas appliances.

If the smell has been there since you bought the unit, it is probably the pilot you are smelling. Generally, a pilot light is first ignited using either an electro-mechanical switch or using electricity to create a spark.

While ignition is taking place, a small amount of gas is allowed to flow through the ignition pilot nozzle. The spark is meant to ignite the pilot flame. When the pilot flame is lit, a thermocouple is heated up and then allows gas to flow to the main burners. The gas in the main burners then ignites directly from the pilot flame. This is generally how gas burners work but there are many types of equipment and not all of them work on the same principles.

Generally when you smell gas before igniting the main burner but detect no smell after the main burner is on, it has to do with problems in the ignition stage. This could be caused by a number of things but often the ignition probe is the problem. The ignition probe arcs a spark between two probes or between a probe and the burner which is meant to ignite the pilot gas nozzle (or in some cases ignites the main burner directly). Everytime this spark is made, a small amount of carbon forms at the connection point of the sparks. The carbon can build up over time and cause difficulty sparking the ignition of the pilot burner. Spilled food can also cause this or speed up the buildup of carbon.

If the gas can't ignite the pilot immediately, the pilot keeps allowing gas to pass into the air until ignited which is what you could be smelling. Check to see how long after you try to start the burner does it actually ignite. More than a couple of seconds and you will be smelling the gas that escaped without being burned off.

You can try disconnecting the unit from mains power and cleaning the ignition probes on each burner. If the unit has a mechanical starter you should take extra care not activate it during cleaning as you could get a electric shock. Clean the probe with a damp cloth or paper towel and don't use any cleaning agents.

If this does not eliminate the smell you are getting before ignition, you should get a technician to test the unit. The explanation above is also very general as I don't know what specific system you are using so use the explanation given as general knowledge only and get a technician to perform the repairs.

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Jul 17, 2016 | Kitchen Ranges

1 Answer

Furnace burners won't ignite


Assuming this is a gas furnace, when the thermostat calls for heat the pilot heats an igniter to produce voltage that opens the burner gas valve. In your furnace, the igniter may have failed and the burner can't fire up

Mar 09, 2013 | Sport & Outdoor - Others

1 Answer

Raypak 403A, burners will not stay lit for more than a few minutes.


i'm thinking after the main valve opens the pressure could be dropping in the pilot tube. this could be due to a dirty, plugged and sometimes spider web inside the pilot tube. rare but does happen, nice warm home for a spider. good luck. if not let me know. could also be weak pilot coil.

Jun 09, 2017 | Pool & Spa

1 Answer

I have an imperial fryer. Pilot is on but main burners don't ignite. Pilot looks normal & thermostat clicks when turned


Number 5 is your thermopile/pilot generator. It is a pilot generator that does 2 things. It holds open the valve with a safety magnet and it operates the safety valve solenoid whenever the control stat calls for heat. Overtime they get weak and will hold the pilot but not operate the valve solenoid. I would replace that pilot generator.thermopile and party on!

Jul 30, 2012 | Imperial IFS40 Deep Fryer

1 Answer

The gas is connected on the rear side of the stove but the pilot light is not lit, nor will it light. trying to trouble shoot the problem before deciding to purchase a new oven/range. Also, I remember...


You may have a pilotless ignition.Check around door frames for model #plate.
Also , open broiler door ,turn on oven and look inside . If you see an orange glow appear after awhile, that is the electronic igniter and you have an electronic ignition(no pilot).In this case the top burners use a spark ignition system.If you don,t hear clicking when you turn on a burner your ignition module might be bad.
Easily fixed though.

Aug 18, 2011 | Whirlpool 30" Self-Cleaning Freestanding...

3 Answers

WHERE IS MY PILOT ON MY FRIGIDAIRE FGF368GM


Hello, There is no pilot..It uses ignitors to light. number 19 in this picture is the oven ignitor http://lookup.bellparts.com/diagramenlarge/frigidaire/47877/00000358
If when you turn on the oven it doesnt glow bright orange chances are it failed and needs to be replaced. The top is electronic ignition. If this helps please rate me..Thanks

Jun 08, 2011 | Frigidaire FGF368GM Kitchen Range

1 Answer

Caloric range oven, older at least 20 years old, the range burners spark, but will not light, i am assuming that its electronic ignition, no pilot light?


If you don't smell gas, then it is probably electronic ignition and not a pilot light.

But if your oven and none of the range burners light, are you sure you are getting gas to the unit or from the range valve to the burners and oven? Can you light the burners with a match? If you can you can rule out the valve and incoming gas line, and concentrate on the ignitors.

Jun 07, 2011 | Kitchen Ranges

2 Answers

What causes delayed ignition, causing a slight boom on lighting main burner?


There will be a web or bug or debris in the pllot asssembly /rail that blocks the path of the transition to main burner or ignition of pilot assembly itself, when it does ignite, theres too much gas built up in the pilot ignitor area and it explodes, clean the orifices in the pilot asssemblt / and or the pilot rail or main burners orifices at the pilot area.

Jan 01, 2010 | Cozy Enclosed Front Console Heater 20,000...

1 Answer

Oven has small explosion igniting and going off. says tj


A few years back I helped a neighbor with this same problem in a forced air, gas fired, "horizontal" furnace in his attic.

After having him cycle the thermostat a couple dozen times while I watched through the opening in the side of the furnace, I finally figured out what was happening.

First, there were about 6 cast iron burners [about 14 inches long with two rows of gas holes along the length]. These burners were parallel to each other and oriented perpendicular to the long axis of the furnace.

The gas was fed to the ends of the burners with a pipe manifold. The standing pilot light was at the center between burners 3 and 4. Due to the spacing distance between the burners, the pilot light was too far from even burners 3 and 4, the flame could not "jump" to ignite them, or any of the other burners. The manufacturer had installed a thin sheet metal "tent" which ran from the gas entrance end of burner 1 to burner 6, and was about 2 inches above the burner, AND the pilot light.

The standing pilot was on all the time. When the gas control valve turned on, gas began to come out of all the burners at the same time. Naturally it came out of the gas supply manifold ends of all the burners.

The "tent" captured that gas coming from the burners and "filled" up to over the pilot light which ignited the gas at that point, and the flame would propagate along the tent to ignite the gas coming out of all of the burners.

In my neighbors case, the tent had somehow become dislodged so that it did not cover all of the burner ends. For those burners which it did cover [including the pilot light] it caused the burners to light properly.

For those burners who's ends were not covered, and who's gas could not be captured, they would NOT ignite simultaneously with the others.

As these burners WERE feeding gas into the combustion chamber, the gas "envelope" would spread until it reached the nearest flame ignition source, at which time the entire "bubble" of gas would ignite with a minor boom [actually a low energy explosion]. Flame would momentarily shoot out of the burner chamber opening, and from that point the furnace would operate normally until the next restart cycle.

Although there could be several causes, I suspect that the symptoms you describe are the result of DELAYED IGNITION of some or all of the main burners.

IF this is the problem, then the solution is to clean all the burners [including the burner outlet holes in the ignition ends of the burners], clean out the burner compartment, AND properly adjust the orientation of whatever system [you have to evaluate how it works from analysis of YOUR furnace] your furnace has to ensure all burners ignite as close to the same time as possible.

When operating properly, the ignition should be a smooth transition, burner by burner, from the pilot to the farthest burners. In other words. the ignition will "flow" from the pilot outward to each adjacent burner until the farthermost ends ignite last. This usually doesn't take more than one or two seconds at the most.

Unless you are an experienced handyman, and understand this analysis and instructions, I strongly suggest that you engage the services of a professional furnace technician.

Feb 13, 2009 | Imperial Commercial Cooking Equipment...

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