Question about RTO W4 A.O Smith Gas Hot Water Heater Draft Inducer

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Gas pilot wont stay on i think i need thermocouple dont know wha size to get or should i just get pilot assembly gvr-40 100 series

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They are universal, the only thing youi need to know is how long it should be, most will take a 30inch, just to make sure you have enough, our oyu can take the one out that you have and match it up, the one you take out will actually measure a little shorter then the new one which is ok, just make sure you put the burner assembly back in the perch correctly, if not you will have bigger problems then you want to have

Posted on Jun 28, 2009

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2 Answers

What pilot light assy. do I need to buy for model# 640y0rt4, water heater ??? please wont stay lit


check that the flame sensor is clean. It would be a stiff piece of wire that would sit right over where the pilot lite is. If it is dirty...it wont sense if there is a flame....and if it dosnt sense a flame....it wont let the pilot lite to turn on.

Jun 03, 2015 | Reliance 606 Series 40 Gallon Natural Gas...

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I have a Rheem PG50T9A gas hot water heater. We had hot water this morning. When I came home the pilot light was out and won't stay lit. Any ideas?


Hopefully just the thermocouple. The thermocouple is the small rod right next to the pilot light. The flame on the pilot heats up the thermocouple and keeps the gas valve on. You can replace it yourself. The thermocouple will be connect by a small nut on the underneath side of the valve, and you will have to pull the thermocouple out of the pilot assembly. Not an expensive part, you can get it at any hardware store. Hope this helps you .

Apr 21, 2011 | Rheem 50 Gallon FVR NATGAS 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?

Feb 04, 2011 | RTO W4 A.O Smith Gas Hot Water Heater...

2 Answers

I have a 40 gal. Whirlpool Water Heater and the pilot light will not stay on. I light it, but it will not hold (stay on) The heater was purchased in Aug 2003. Model No. FG1F4040SNOV. Any ideas?


The thermocouple has gone bad.
You will need to replace it. The video at the link below is a good overall view.
I would use soapy water for the leak test mixed at about 90 to10 (soap to water.
Also when you have the assembly removed clean the area with a vacuum and clean the assembly also.

Take the old thermocouple out before you go the the store to replace it as the do come in different sizes/lengths


http://videos.howstuffworks.com/discovery/34524-gimme-shelter-replacing-a-thermocouple-video.htm

Feb 03, 2011 | Whirlpool Water Heaters

1 Answer

Pilot wont stay on


Thermocouple has failed., replace thermocouple or dirty pilot assembly, not enough heat being genrated to produce the 30 mili volts D.C. current to hold the pilot valve open. Clean pilot orfice. Remove assembly and pilot tubing from gas valve. Blow into pilot tubing to remove dirt.. Make sure pilot flame is engulfing the thermocouple.

Jan 25, 2011 | Whirlpool Water Heaters

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...

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).

Sep 10, 2009 | Reliance Water Heater #9003531 NAT Gas...

1 Answer

I don't know how to restart my old bosch water wizard 10p, pilot light has gone out.


get a long stick match, a flashlight remove lower inspection cover, find thermocouple and pilot light will be next to it,turn gas valve to pilot light and hold down,stick the match in by thermocouple till the pilot lights and hold valve down till pilot stays lit,this may take a minute or more,then release gas valve and see if pilot stays lit, if not retry,if it wont stay lit,the thermocouple is defective and needs replacement

Jul 12, 2009 | Bosch & Tankless LP Hot Water Heater

1 Answer

The pilot light on my gas water heater continually goes out. I can re-light the pilot and get it going. The gas burners goes on runs for awhile. I'm assuming when that when the temp hits the desired temp...


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The pilot assembly should look similar to the pic above. Depending on where you live, you may be required to hire a certified plumber to replace the parts. If not you can do it your self. Keep in mind if it's not staying lit you also need to check the thermostat and the thermocoupler before replacing the pilot assembly. There is a good chance it is just the thermocoupler going out. It is one of the first things to check when troubleshooting a pilot light problem with a gas water heater. A thermocouple determines if the pilot light is lit. If it's not lit, the gas valve fails. If that's the problem, replace the thermocouple.


  1. Shut off the gas valve on the water heater and the gas valve on the line near the heater. Remove outer and inner doors, and loosen the pilot and supply tubes and the thermocouple connections to remove the burner assembly.
  2. Step 2 Loosen the screw holding the thermocouple to the bracket. Remove old thermocouple. Bring it with you to the store to ensure you are buying the proper replacement.
  3. Step 3 Install the new thermocouple. Position the thermocouple so that the pilot flame heats 1/2 inch of the tip.
  4. Step 4 Reinstall burner assembly in the water heater. Tighten burner supply tube, pilot tube and thermocouple connections. Tighten thermocouple no more than a quarter turn more than hand-tight.
  5. Step 5 Turn on both gas valves. Check supply tube and pilot tube for leaks with soapy water. If soap bubbles, tighten connections to fix leak. Ignite the pilot light, and make sure the thermocouple tip is heating up. Replace inner and outer doors.

Jul 09, 2009 | Northern Tool Water Heaters

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