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Gas Hot Water Tank Not Producing Hot Water

Gas Hot Water Tank Not Producing Hot Water

Pilot will not stay lit



Trying to light your pilot light and it keeps going out when you turn on you gas valve. This is a common problem when your thermo-couple goes out. The thermo-couple sends a small electrical charge to the gas valve to keep its self lit. When the unit calls for heat the pilot flame gets bigger producing more electric and tells the gas valve to open the main gas valve to the burner tubes. The thermo-couple is an easy item to change most of the time. You will need to follow these steps to change out your thermo-couple:

1. Turn off the gas (there is an inline shut off on the supply line before it reaches the gas valve, you need to turn this crossways to the pipe)

2. Locate the thermo-couple it will look like this and be attached to the gas valve

3. Unscrew the thermo-couple from the gas valve

4. Remove the other end of the thermo-couple from the pilot holder

5. Measure or take the old thermo-couple to the hardware or appliance store with you to get the proper length (there are many different lengths of thermo-couples)

6. Reinstall the bulb end at the pilot

7. Reinstall the threaded end on the Gas Valve (make sure not to cross thread the thermo-couple it should start by hand)

8. Turn the gas valve to the pilot position and hold down the red button wait a few seconds then turn off and do again (you will need to do this around 5 times in order to get the gas back up to the pilot light then try and light the pilot)

9. Try to ignite the pilot light.

10. Once you get the pilot light lit you will want to hold down the button for 60 seconds then turn the gas valve to the on position.

Here is an image of a thermo-couple (they will all look similar to this):





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1 Answer

the pilot won't stay lit on gas hot water tank.


Make sure thermocouple tip is seated inside the burner flame.
Make sure thermocouple is not overtightened. Finger-tight + 1/4 turn.
If the pilot lights, then ECO energy cut off is not tripped, but gas control valve might be bad.
Check color of pilot flame: it should be strong and clear blue.
If pilot flame is weak, or color of flame is yellow-orange: Clean pilot orifice and burner and combustion parts on yearly basis.
Clean air intake screen if applicable.
Increase air supply to water heater. Open a window and see what happens.
Check for adequate draft going up chimney using match under vent hood to see if smoke drafts immediately upwards.
Bleed air out of gas line.
Check gas pressure.

Open following links for troubleshoot resources:
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
http://waterheatertimer.org/pdf/Pilot-outage-troubleshooting.pdf
http://waterheatertimer.org/pdf/Vent-spillage-test-atmospheric-gas-water-heater.pdf
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

Sep 21, 2011 | Water Heaters

1 Answer

Reliance 606 natural gas water heater - model #640YORT - water does not stay hot. pilot has to be clicked to heat and then u can use hot water til tank empty and it will not continue to heat water.


If I understand correctly, the pilot light is not staying lit.
You light the pilot and water in the tank reaches temperature.
Once hot water is gone, then pilot light has to be lit again.

Gas pressure is good, and gas is flowing.
Thermostat is working at high end because it cuts off heating.
Vent is working because tank heats up.
Air intake is working.

Gas control thermostat might not be reading low temperature. Replace gas control valve.
Pilot tube might be dirty. Clean burner parts and combustion chamber, and air intake, and vent.
Backdraft might be blowing out pilot. Check for constant updraft by running water heater 5 minutes, and then light match under vent hood and see if smoke goes up.
Very hot air can put out pilot, especially when water heater located in attic. Add ventilation.
Improper vent might have water dripping back down into combustion chamber and putting out pilot light and rusting out the parts. Inspect for rusted parts and water.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf

Aug 09, 2011 | Reliance Natural Gas Water Heater Control

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...

1 Answer

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

2 Answers

Natural gas hot water heater not stying lit


Probably a bad solenoid in the gas valve. Higher voltage of a new thermocouple keeps it open longer but it still fails over a period of time. Look into a new gas valve for the water heater.

Dec 17, 2009 | General Electric GE SmartWater Household...

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