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Water heater burner won't light - Heating & Cooling

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Generaly three things are the problem, first the easy ones, pilot and or thermo couple, cheaper to replace, and usually fixes the problem. Last would be the gas valve itself. Good luck to you.

Posted on Dec 08, 2008

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Heater is not igniting


see this causes and fix it. God bless you
f there is no heat, check the electrical service panel for a burned fuse or tripped breaker. Relight the pilot light (see below). If there is not enough heat, adjust the burner air shutter (see below); and clean the burner ports (see below).
If the pilot light does not light or does not stay lit, clean the pilot orifice carefully with a toothpick, test the thermocouple and replace it if it is faulty (see below).
If the flame flickers, adjust the pilot (see below).
If there is an exploding sound when the burner ignites, adjust the pilot to a higher setting and clean the pilot orifice and the burner ports.
If the burner takes more than a few seconds to ignite, clean the pilot orifice and adjust the pilot light.
If the burner flame is uneven, clean the burner ports. If the burner flame is very yellow, clean the burner; open vents in the furnace room to provide more air; adjust the burner air shutter.
If the furnace makes a rumbling noise when the burners are off, clean the burner and adjust the burner air shutter.
If the air is too dry, wash or replace the evaporator pad if you have a humidifier; test the humidistat; and adjust the water-level float to raise the water level.
If some rooms are too cool and others too warm, the distribution system may require balancing. Refer to the Forced-Air Distribution Fix-It Guide .

Oct 08, 2012 | Intertherm Heating Cooling System 15kw...

2 Answers

I turned on hot water to take a bath, and it was hot. by the time the tub had filled the water was freezing. now we cant seem to get hot water out of anywhere. the pilot light is on. the knob is set to on,...


if I was a betting may I would say that this is a small water heater, what is the temperature set on, as the pilot light will be lit once the temperature is reached, but until then the burners will be lit. I would move the temperature knob and listen to see if I hear the burners kick on. Hope this helps Tim

Apr 17, 2011 | Heating & Cooling

1 Answer

I have a gas water heater, 6 years old. The pilot will lite and then the burner lites up, after several seconds the burner goes out. It won't stay lite. The other gas appliances are working. What's...


The Thermocouple, which is part of the ignition system may be loose, where it screws into the gas control valve. Or it needs replacing.

But, first turn the gas off to the water heater, allow the burner compartment to cool off and with a flash light do a visual inspection of the burner chamber. If you see rust or scale in the chamber or on the burner, it will need to be cleaned. You can use a wire brush to clean the burner, making sure you do it carefully and not too aggressively. Use a shop vac with a hose and crevice tool to remove the debris that was created when you cleaned the burner. Be sure to vacuum the burner ports well.

Look for the Thermocouple ... it will be in front of the pilot flame and look like a 2 to 3" long piece of copper. It will have a copper tube running from the bottom of it to the gas control valve. Does the Thermocouple look pitted and worn? Dos it have a hazy film on the tip? If so, use some very fine grit sand paper to polish the Thermocouple. You don't want to sand it, as much polish it. After you have completed that, use a cotton ball dipped in alcohol to wipe off the Thermocouple.

You remember the copper tubing I mentioned that runs from the Thermocouple to the Gas Control Valve? Trace that tuning to the control valve and see if you can loosen the connecting nut to the control valve with your fingers. If you can, it's loose and needs to be retightened. Finger tighten it and with an appropriately sized open end wrench tighten only 1/4 turn more. Turn the gas back on and light the pilot, following the lighting instructions on the water heater. Allow the control knob to remain in the pilot position for at least 1 minute before turning the control knob to ON.

The water in the tank has probably cooled enough that the burner should fire up. If it doesn't turn on the hot water side of faucet, to drain the tank some, so that the burner will fire.

Once it fires, take a stick match, light it then blow it out. Quickly place it next to the opening at the top of the tank where the Exhaust Vent Pipe is connected to the tank. If the vent is drawing properly, it should **** the smoke quickly up the vent pipe. If it doesn't, you'll need to check the vent pipe for obstructions or disconnections at the couplings along the pipe.

If the burner does not continue to operate properly after you have completed all of this. Replace the Thermocouple. Remove the one you now have and take it with you to a hardware or home improvement store, so that you can match it up to the ones that are available.

Hope all this solves your problem. Please let me know.

Feb 12, 2011 | Heating & Cooling

1 Answer

Unit is full of water pilot lights and burns but burner will not work


If this is a water heater I assume.....the gas control is most likely faulty

Dec 28, 2010 | Heating & Cooling

1 Answer

My hot water pipes were froze this morning. Michigan! I have cold(almost froze) There is not any water coming out in kitchen from hot side. I have cold though in every room. There is water coming out a...


no easy fix . your water heater should be fine most likely its up to temp ,thats why its not lighting its main flame . the frozen pipe is another story you need to get the heat up in the house open any cuppord doors that have pipes in them like under a sink ( to let heat from the room get it there ) leave a faucet on hot and wait . at some point you will unfreeze . but you migh end up with a broken pipe so keep your eye out for a water leak . good luck

Jan 16, 2009 | Heating & Cooling

1 Answer

Water heater burner flame is low does not heat water it was working this morning pilot stays lit


frist did this heater go under water if so call the pros.this can be do to dirty orfic on burner. clog presure regulater at gas meater check other gas applince.

Sep 17, 2008 | Intertherm Heating & Cooling

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