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No flame on my gas water heater

How to troubleshoot and find the cause

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  • Water Heaters Master
  • 5,089 Answers

1) Copy following link to troubleshoot by type of gas control.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

2) Clean air intake, and check if air intake is clogged, causing overheating caused by reduce air intake and slowed exit of combustion by-product up the vent.
http://waterheatertimer.org/How-to-repair-Rheem-TRD.html

3) Post question on pro water heater forum:
http://www.thetankatwaterheaterrescue.com/forums/forum3/

Posted on Dec 03, 2012

4 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 14 Answers

SOURCE: Rheem water heater, will start but flame lasts 10 seconds

Is the vent fan working well and can you feel unobstructed air out the termination fitting outside?

Posted on Apr 05, 2009

  • 129 Answers

SOURCE: I do not have a flame for my water heater. I have

the thermocouple needs to be replaced.

Posted on Sep 26, 2009

motor1258
  • 6674 Answers

SOURCE: I have a 6 gallon

Your on right track. When this happens and small flame still there, pull wire(s) off at gas valve, or test for voltage from ECO to gas valve. No voltage, then there should be no gas. Change gas valve.

Posted on Oct 20, 2010

Testimonial: "Changed the gas valve, now heater works as it should, No fumes and no flame after shutoff."

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1 Answer

I have a Bosch gas tankless water heater, model GWH 425 EF. The igniter does not stop sparking once the flame is lit. What will cause this?


Your electronic ignition unit is not rectifying through the gas flame, it is a sensitive piece of equipment and has failed.

Jun 08, 2015 | Bosch Water Heaters

1 Answer

Richmond 5v40-7 gas water heater. Burner lights completely but flame is very low. Does not grow above 1/4 inch.


Is flame clear blue or yellow?
Yellow flame, clean the flame arrestor screen
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html


Flame is blue:
Low gas pressure.
Bad gas control valve.
Dirty combustion parts.
Clean the water heater parts and catch up on maintenance.-
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

Gene

Nov 01, 2014 | Water Heaters

1 Answer

Flame burning too orange


You must get more air to water heater, and check venting .... immediate CO poison danger.
Call qualified plumber immediately.... because deadly carbon monoxide is not being vented properly.
http://waterheatertimer.org/Water-heater-safety-precautions.html#soot

Gene h

Mar 27, 2014 | Water Heaters

1 Answer

Hot water tank doesn't stay on


Suspect the thermocouple that senses that the pilot is lit. This device prevents the gas burner from coming on when if the pilot goes out, but if it's defective could cause the burner to shut down even when there is a pilot flame. Also check the position of the thermocouple in relation to the pilot flame. The tip of the thermocouple should be right in the middle pilot flame.

Oct 11, 2013 | Audiovox Richmond 6G40-36F 6-Year Tall Gas...

1 Answer

The pilot and flame dont stay on


Look at label on side of product for Brand, model and type water heater.
Add a comment with that specific information.
Many of the questions I see are shortened to a few words.

If you have Reliance gas water heater with FV system, then clean air intake located on bottom of water heater using feather duster, or compressed air.
Other causes could be FV event that tripped TCO, and/or shorted out gas control valve.
Or you could have bad gas control valve.
Or dirty combustion parts.
Or all the above.

Inspect and clean air intake.on reliance:
http://waterheatertimer.org/images/Flame-trap-inspection.jpg
Troubleshoot Pilot
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#pilot
Replace gas control valve:
http://waterheatertimer.org/pdf/How-to-replace-water-heater-gas-valve.pdf

Oct 07, 2012 | Water Heaters

1 Answer

Kenmore Water heater, Model # 153.339462, Pilot lights, burner burns for approx. 10 - 15 minutes then both go out. after which it is more difficult to light the pilot. I need ideas please


Clean combustion parts, clean air intake, get more air to water heater and see if problem continues.
Look at color of burner flame and pilot flame: if flame has yellow-and-orange instead of clear blue flame, then combustion parts need cleaning.

Pilot and burner problems can be caused by bad thermocouple, thermocouple not sitting in flame, weak pilot flame due to dirty tube or low gas pressure, air in gas line, no draft up vent, backdraft coming down vent, dirty combustion parts, clogged air intake, insufficient air, insufficient air quality, hot attic, bad gas control valve, etc.

Open following link for pdf resources, and illustrations for cleaning combustion parts, and some service manuals:
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

Take a moment and rate answer:
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Sep 03, 2011 | Water Heaters

1 Answer

The pilot will light but as soon as the button is released is goes out


1) If water heater has electronic gas control thermostat, then the gas control needs to be tested and possibly replaced. Add a comment and describe electronic gas control.

2) If water heater has non-electronic gas control thermostats, problem sounds like the thermocouple. Problem could also be bad gas control.
Make sure end of thermocouple sits in the pilot flame.
http://www.youtube.com/watch?v=v0aBPsNg6vo

Buy thermocouple at local hardware. They vary by length, for example 18".
Thermocouple screws into bottom of gas control thermostat.
Finger tight plus 1/4 turn. No pipe joint compound or teflon tape on threads.
http://waterheatertimer.org/images/IMG_9146-gas-control-thermo.jpg

Heat from pilot flame travels to gas control thermostat.
Heat is changed into small electric current using a thermistor.
The small current tells gas control that pilot flame is ON, and so gas control keeps gas flowing.
If thermocouple is not working, or has fallen away from pilot flame, the gas control turns off gas to pilot.
This safety device is necessary so gas does not fill up house and cause explosion.

http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean

Aug 22, 2011 | Water Heaters

1 Answer

Open flame remain out of the outlet manifold in the air shutter vent when i turn off the cabin switch of my suburban 6gl water heater


If flame remains after power shut off to gas valve, then the gas valve is obviously leaking by and can cause a very dangerous situation. PLEASE !! Shut propane off until that can be addressed.

May 20, 2011 | RTO Suburban Rv Water Heater Dsi Gas Valve...

1 Answer

My model 501, 30 gal, LPG water heater only makes warm water, is this fixable, or should I think replacement?


Look at the flame and see if it's burning blue or yellow. And then see if it's burning all the time. If the flame is yellow and water heater does not make hot water, the thermostat may keep the flame going all the time and use up your gas.

Poor flame color means you should clean the burner or replace the burner. If water heater is exposed to trace amounts of some chemicals, like bleach or pool chemicals or wax, these chemicals get pulled into the burner and will shorten life of burner assembly and combustion chamber.

If the flame is blue and the water is not hot, then the thermostat is the best suspect. The thermostat is part of the gas valve. The gas valve has a copper tube that extends into the water and reads water temperature. If thermostat reads incorrect temp, then the gas valve needs to be replaced with gas valve from local plumbing supply of Lowes.

If the flame is blue, and it runs all the time, then your tank may have a layer of sediment between the flame and the water, and the sediment has caused water heater to become very inefficient.
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html

Now to answer your question:
You can turn up the thermostat dial located on front of tank.
Check your flame and how often burner comes on to determine where problem is.
You can buy a gas valve from Lowes for $65 or from plumbing supply and then replace >> you need a couple wrenches and pipe joint compound and about half a day.
You can clean the burner with wire brush and shop vac.
Remove chemicals from same room as water heater.
If the water heater has sediment build-up, then a new water heater is probably best choice.

You can do some things yourself. If the do-it-yourself steps don't work, then get a new water heater, and you know more about maintaining a water heater because you worked on the old one. Save the new water heater manual. Read the manual because it has ordinary information that will save you money long-term.

How to determine age of water heater
http://waterheatertimer.org/pdf/WaterHeaterSerialNumberDecoder.pdf

Oct 23, 2010 | Reliance & 30 Gal LP Gas Water Heater

1 Answer

The number 12 shows and there is no hot water


The error 12 means flame loss. It is most commonly caused by insufficient gas pressure supplied to the unit, but it can also be caused by debris on the flame rod. Blockage in the exhaust vent or a stuck flue damper can also cause a 12 error code

Nov 09, 2009 | Noritz 6.9 Gallon Residential Direct Vent...

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