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Hot water heater

Pilot light goes out when i turn hot water heater on . just replaced thermocouple. any suggestions?

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There is the possibility you don't have the thermocouple set in the right place. The flame has to hit it just right. Does the pilot stay on until you turn the gas valve to on, then shuts off, or does it shut off as soon as you let go off the button?

Posted on Dec 23, 2007

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1 Answer

Vaillant gas water heater - pilot light only, not lighting the main gas ring when tap is turned on..


first check to see if the thermocouple is close enough to the pilot. if it is and won't light the ring, replace the thermocouple.

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Reliant 501 Natural Gas won't stay lit


Reliance water heater?
Thermocouple is good if the pilot stays lit continuously.

501 is older model. Unknown if this unit has FVIR protection and sealed combustion chamber or open air intake on front of unit.
http://waterheatertimer.org/pdf/Reliance-2006-Service-Handbook.pdf

With FVIR protection:
Get more fresh air to the unit.
Clean the flame arrestor screen.
Test and replace the thermocouple:
http://waterheatertimer.org/How-to-test-water-heater-thermocouple.html
Inspect and clean burner and combustion parts
Test gas pressure, bleed air out of gas line.
Replace gas control valve.
Test draft air by lighting match and see if smoke is pulled into the vent pipe at draft hood on top of tank.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Aug 20, 2012 | Water Heaters

3 Answers

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...

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My hot water heater won't engage at all.


Sounds like the pilot light is not staying lit, provided you have one. The pilot light is used to keep the gas valve open by way of the thermocouple/switch. When the pilot light goes out the thermocouple cools down and shuts the supply of gas off to the water heater burner. It is not unusual for a thermocouple to go bad at which point it needs to be replaced. The thermocouple is the small rod that sits in or close to the pilot light flame. There is a small copper tube that runs from it up to the gas valve on the outside of the tank. This is where you control the temperature of the water as well as light the pilot light. If you are not experienced in dealing with hot water heater gas supplies, you should get professional help.

Oct 14, 2010 | Vacuums

1 Answer

M# 640HORT4 s# H07A090378---MY Pilot Light wont


Hi,
First thing is to replace the thermoscouple. When you light it you get it a bit hotter then normal. You turn on the main burner which keeps it hot. Then when it goes back to just pilot the flame is not hot enough to hold the pilot valve in.
Replace the thermocouple and you will be fine...

heatman101

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3 Answers

Pilot light on water heater goes out frequently and thermocouple has been replaced 3-4 times. Richmond 30 gal, gas, model 5V30T. Thank you


Check the following:

See if your heater has a pilot gas adjustment valve. It should be on the gas control valve somewhere. Not all heaters have these. It will be a screw on the valve that can be turned.

Make sure the thermocouple sensing bulb is squarely in the pilot flame and also check that the fitting where the other end of the thermocouple connects to the main gas valve is tight.

Check the pilot gas orifice (where the pilot gas comes out) for carbon build up - you may need to remove the pilot gas line and thermocouple assembly to get to this. This problem is pretty common.

Check the gas pressure to the heater. Run the hot water in the dwelling until the hot water heater starts. Check the flame on the main burner and see what color it is - it should be blue with possibly some yellow-tipped flames. If not, there could be a problem with the gas pressure at the heater or venting. If the heater has a gas pressure regulator, it may be out of adjustment or defective.

Finally, and this isn't very common, the pilot light can be extinguished if there is a draft problem, usually associated with an issue with the flue pipe venting system for the heater or another nearby gas consuming appliance.

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1 Answer

NO HOT WATER N THE PILOT NOT LIGHTING UP


The thermocouple has gone bad.The thermocouple needs to be directly in the pilot flame.When the thermocouple goes out,the flame most of the time will have burned the thermocouple tip a way.If it was not for this devise,the gas would exscape,and fill the home up.This is a safety feature.

Oct 20, 2009 | Heating & Cooling

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

1 Answer

Water heater won't run long enough for hot water.


Common problem if the thermo couple goes bad.Replace thermocouple with a universial on.A common hardware item.

Dec 14, 2008 | Water Heaters

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