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Pilot goes out

For the last week the pilot on the A O SMITH water heater has been going out. and is VERY difficult to get lite againI have only the information given to me by my tenant as the heater is not in my house.The plumber has been over 3 times and my husband several and can not find the cause.Any suggestions.THANKS so muchbj

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  • bj14 Nov 27, 2008

    Thanks so much.   We will try this next.
    bj

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IF THIS IS A STANDING PILOT TYPE WATER HEATER MEANING THE PILOT STAYS LIT ALL THE TIME IT IS USUALLY CONTROLLED BY A THERMOCOUPLE WHICH IS USUALLY THE CULPRIT THIS IS USUALLY AVAILABLE AT ANY GOOD HARDWARE STORE GET THE SAME LENGTH AS YOU TAKE OUT EX 12-18-24 INCH

Posted on Nov 27, 2008

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1 Answer

Pilot light not stay lit


Copy following links:
http://waterheatertimer.org/How-to-light-gas-water-heater.html
http://waterheatertimer.org/How-to-install-gas-water-heater.html
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
http://www.thetankatwaterheaterrescue.com/forums/forum3/
Reliance is made by AO Smith company, and air intake located on bottom of unit.
Make sure you have adequate incoming air and vent is working.
Remember, the pilot is located upwards from the viewing sight-glass, so it is sometimes difficult to see pilot.
Pilot flame must burn clear blue, with bits of yellow and red. Yellow flame means inadequate air supply or venting.

Gene
h

Sep 26, 2013 | Reliance Natural Gas Water Heater Control

1 Answer

I have smoth's hot water tank. problem is pilot lite is off. how do u turn it on?


You have tank-type gas water heater with standing pilot light.

Instructions for lighting pilot light are usually on front of water heater.
Since water heaters vary widely, if you want specific information without guessing, then add a comment with model number that appears on label on side of tank, and also describe the gas control valve on front of unit.
This information will let expert located manual and look up specific information plus troubleshoot steps for that model.

Aug 24, 2011 | RTO W4 A.O Smith Gas Hot Water 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?

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2 Answers

Gvr 40 100 will not stay lite


The Cold air screen on the bottom of the water heater is partially plugged. That is if the pilot light can be lit and stay on, but goes out when the heater should be functioning normally. This is not the removable plastic screen but a round white-yellow grid with 1/32" holes. You can try to clean it through the bottom but you may have to remove the gas line from the controller to the burner, pilot gas line, and thermocouple connection to remove that complete assembly to get access to the screen. The AO Smith booklet warns of this but they pretend the plastic screen will keep this second screen clean but it won't. After three years it was two thirds plugged.

Dec 12, 2009 | RTO W4 A.O Smith Gas Hot Water Heater...

2 Answers

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, and it goes out again in less time...


The thermocouple is the copper one the other is the gas supply to the burner check your flue pipe for restrictions see if a flame from a lighter sucks up the flue from the top hood you may need a new gas control valve

Nov 04, 2009 | Water Heaters

1 Answer

AO Smith water heater about 4 years old pilot went out took out piolt assembly cleaned and was able to relight pilot unit stayed working for about 2 weeks and went out again any ideas?


It sounds like your flame detector (usually a thermocouple) has gotten weak and when you cleaned the pilot the stronger flame was able to generate enough power to keep the gas valve working. If you replace the thermocouple your problem should go away. If a new thermocouple will not keep the gas valve operating...the coil in the gas valve has gone bad and you will need to replace the gas valve assembly. (most valves do not have replaceable coils).

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