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Older but functioning Vulcan natural gas water heater requires pilot relighting every cycle.Burner removed and jets cleaned. What are the adjustments on the rotary gas/air valve?

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I would suspect the thermal coupler is bad or at the very least out of adjustment. The Thermal Coupler must be in the flame when the pilot is lit. If it is close but barely being touched by the flame it will do just what you are experiencing. If it is in the flame replace it.

Posted on Oct 14, 2010

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How to Change the Gas Valve and Thermostat on a Hot Water Heater


<p>If you are having<b> trouble with the temperatures</b> of your <b>gas hot water heater</b> fluctuating too much, or after <b>changing the thermocouple</b> of your gas <b>hot water heater</b> then you may need to change the complete <b>gas valve and thermostat assembly</b>. Also if you have changed the <b>thermocouple</b> and the pilot still will not stay lit, then the gas valve could be bad or the <b>ECO (Emergency Cutout)</b> may have activated and is open. This is a onetime device and cannot be replaced.<br /> <p><br /> <p>These instructions are for the older style <b>gas valve and thermostat combination</b>. These commonly have a large red knob that adjusts the temperature of the water. Also note that the burner tube nut for <b>natural gas</b> is right hand thread, but if you have <b>LP or propane gas</b> the burner tube nut is left hand thread.<br /> <p><br /> <p>The newer <b>gas valve thermostat combinations</b> that have come out recently are similar, but they have a well in the tank that the sensor slides into. The assembly is held fast with a set screw. With this type of <b>gas valve and thermostat unit </b>the tank does not need to be drained, but most of the rest of the change out is similar.<br /><br />To change a <b>gas hot water heater thermostat</b> you will need to first buy a new gas valve for your <b>hot water heater</b>. The <b>gas valve</b> and the <b>thermostat</b> are integrated into one unit.<br /><br />To <b>replace the thermostat on a gas hot water heater</b> you must follow these procedures....<br /><br />1. Turn off the incoming water and<b> drain the hot water heater</b>.<br /><br />2. Remove the <b>pilot tube</b>, the <b>burner gas tube</b> and the thermocouple from the gas valve. Turn off the <b>gas line</b> and remove from the gas valve.<br /><br />3. Get a <b>pump pliers</b> or a<b> wrench</b> in behind the gas valve and turn the whole assembly CCW to remove it from the tank.<br /><br />4. After applying pipe dope or tape to the new gas valve threads, turn the new gas valve into the tank by turning in a CW direction. Be careful not to damage the small wires to the <b>ECO</b>. They are the little red wires on the back. If you break them the assembly is irreparably damaged.<br /><br />5. Reinstall the gas line, thermocouple, burner tube, and the pilot tube to the gas valve.<br /><br />6. Fill tank with water. Make sure to open a <b>hot water faucet</b> and <b>purge all air from the tank.<br /><br /></b>7. <b>Check for leaks</b> where the gas line hooks up with soapy water.<br /><br />8. Relight pilot light and check operation.<br /><br />9. Set the new temperature setting to a medium setting and then adjust the temperature to your liking from there and adequate time for heating completely<br /> <p>

on Feb 25, 2011 | Water Heaters

1 Answer

I have a 40 gallon natural gas operated Rheem manufactured GE smartwater that has been shut off since pilot could not be lit. I would like to lit the pilot but I would like to know if I should switch the...


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Why did water heater turn off?
If water heater was exposed to flammable vapors like gasoline, paint thinner, paint, leaking gas line, etc, then the 'single use gas shut off' might have tripped.
If water heater is older and the burner parts never cleaned, then combustion chamber can experience overheating, and that can trigger 'single use shut off.'

Instructions for lighting water heater should be printed on side of heater.
Follow the instructions and see if water heater will light.
Then check if flame is clear blue. If flame is yellow-orange, then burner parts need to be cleaned.
If water heater will not light, then combustion parts may need to be cleaned, and air intake cleaned, and 'single use shut off' could also be tripped.

Also possible that gas control valve thermostat is bad.

Open following link to help identify gas valve and see illustrations and read information about cleaning combustion parts:
http://Waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html#intelli

Sep 10, 2011 | Rheem 40 Gallon FVR NATGAS Low WATER...

1 Answer

I have a reliance power vent heater model 8 40 navto . When the water temp called for the heater to work the solenoid started clicking and when it stopped the pilot flame was out and cannot be relit. The...


First suspect is always to clean combustion parts.
I don't have that specific manual, but assume unit has digital gas control valve thermostat.
http://www.reliancewaterheaters.com/lit/om.html
As a general rule, the gas control thermostat activates the blower and turns on the gas, and controls flow of gas to pilot.

If the ECO is tripped, or there was FV event, or the gas valve thermostat is bad, or the combustion parts and tubes need maintenance and cleaning, then the pilot will not relight.
Open following link for older Reliance troubleshoot manual, plus some troubleshooting resources and illustrations:
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

Add a comment and say what you did to restore functionality.

Jun 13, 2011 | Reliance Natural Gas Water Heater Control

1 Answer

Can not get pilot to lite was working fine had to turn off gas will I changed out some water pipe went to relite and could not get pilot to lite


I would first make absolutly sure that I had all air bleed out of gas line to water heater. If you are trying to bleed air out thru pilot assembly this can take a long time because the opening in pilot orifice is very small. To speed up process if you have a union close to unit or flex connector,you can slightly loosen fitting till you can hear a little hiss of escaping air/gas. When you first smell gas immedieatly tighten fitting. Before you do this make sure there are no standing piloy lights or other sources of flame in the vicinity. When you smell gas and tighten fitting back up try to relight pilot to water heater.If you still can't get pilot to light I would remove pilot line from gas valve and burner. Check to see if you can blow thru it, visually inspect pilot orifice, and if blocked I would get a orifice cleaning tool from hardware or welding supply store. Be careful to select the right size for your orifice and clean it. Reinstall and try to light pilot again.Hope this helps. Thanks

Nov 17, 2010 | Bosch AquaStar 125FXKIT-NG 125FX Natural...

1 Answer

Pilot goes out after heat cycle, relight and it stays burning untill next heat cyle has run.


This sounds like a dirty pilot jet orifice or a weak thermocouple. The pilot orifice can carbon up (natural gas is a fossil fuel), become weak and keep going out whenever the main burner lights, which causes a pressure drop in the gas line. The thermocouple can also become dirty and not sense properly.

The pilot light assembly should be cleaned. The gas must be turned off and it's best if the pilot assembly can be removed. Automotive carb cleaner can be used to clean the orifice. Do not try to insert any object into the pilot orifice valve as this can result in damage.

If cleaning does not resolve the problem, replace the thermocouple first. Make sure it is installed correctly and is squarely in the pilot flame.

Dec 10, 2009 | Rheem 40 Gallon FVR NATGAS Low WATER...

1 Answer

Pilot light went out but will can,t get it relit it only stays on as long as I hold the button down


Is the thermocouple in the pilot flame? & does it get hot [glow red] If not adjust position until it does & make sure it's clean
If thermocouple gets hot but no relight, replace couple

Oct 26, 2009 | Bosch AquaStar 125FXKIT-NG 125FX Natural...

1 Answer

Gas tankless water heater turns off during shower


Take the thermocouple out and match it up at any hard wear store. Maybe $10. Replace it .Make sure the flame is clean and hitting the rod in the center center. Ajust (Bend) accordingly.

Feb 23, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

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