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Gas valve replacement procedures - Water Heaters

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Tank-type gas water heater control thermostat?
http://waterheatertimer.org/pdf/How-to-replace-water-heater-gas-valve.pdf

Tankless gas water heater.
Each brand and model might have different instructions.
Some tankless companies post manuals, most do not, and want work done by professional.

Posted on Nov 07, 2012

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Gas valve faultdetected


Copy following link to troubleshoot by type of gas control valve, and read how to replace gas control:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

There are basically two types of Honeywell gas control valves.
One for atmospheric-vented water heater, and one for power-vented
For both types of controls: 8 flash + 3 flash error: replace gas control valve.
Water heater does not need to be drained to replace this gas control.

Apr 01, 2013 | Honeywell Water Heaters

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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

2 Answers

We have a reliance sta kleen 805 lp water heater that we installed used and it will not let us go through the start up procedure. i assume its in some kind of lock out mode, it does not respond to hot...


Used, Reliance 805 is power vent gas
10 year old water heater that is newly installed.
Unknown gas control valve.
I'm not a fan of installing old power vent water heaters.
Usually these things are so expensive that old one is only replaced when it fails.

120Volt Outlet must have correct polarity and unit must be grounded between ground prong on cord to manifold tube connected to bottom of gas control valve. Test for continuity with multimeter.

Is this an early FV model with air intake located on bottom?
If air intake is clogged with dust, then combustion chamber overheated and tripped FV system. The older heaters need replacement parts and new gas control valve, or entire heater must be replaced.

Replace gas control valve.
http://waterheatertimer.org/pdf/How-to-replace-water-heater-gas-valve.pdf

Copy following link for gas control troubleshoot by type of gas control.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

Post question on Tank forum with more information about type of air intake and gas control valve and history of water heater
http://www.thetankatwaterheaterrescue.com/forums/forum3/

Oct 25, 2012 | RELIANCE ELECTRIC WATER HEATER

2 Answers

My Rheem water heater is giving a ECO failure, How can I fix this?


Question posted under Rheem water heater.
Model number and gas valve are unknown. Add a comment.

Following information applies to typical tank-type gas water heater, and does not apply to tankless water heaters, boilers, indirect heaters, solar water heaters, etc or for electric water heater.

Electric water heater ECO is located on upper thermostat.
Open top cover and ECO can be reset by pushing in red reset button,
Or ECO can be replaced by replacing thermostat. Add a comment.

Open following link to see typical tank-type gas water heater ECOs:
http://waterheatertimer.org/images/Intellivent-ECO-900.jpg
http://waterheatertimer.org/images/Typical-gas-valve-500.jpg

The ECO will trip at 180-200 degrees F.
This happens when the thermostat fails, then the burner stays on, and the water will continue heating.

With most water heaters, the ECO is one-time use device and the gas control valve is replaced.
Some water heaters have resettable ECO, but the overheating problem has to be solved.
Each water heater is different.
Contact Rheem or read manual for correct procedure.

If you have intellivent gas control valve, open following links for typical service manual:
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html#intelli
http://waterheatertimer.org/pdf/Intellivent-service-manual.pdf

More resources:
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

Sep 30, 2011 | Water Heaters

1 Answer

It says if my ECO has tripped the water tempature has exceeded 200F. What would cause the tempature to reach 200F


Question posted under Rheem tank-type gas water heater.
Model number and gas valve are unknown.

Open following link to see typical ECOs:
http://waterheatertimer.org/images/Intellivent-ECO-900.jpg
http://waterheatertimer.org/images/Typical-gas-valve-500.jpg

The ECO will trip at 180-200 degrees F.
This happens when the thermostat fails, then the burner stays on, and the water will continue heating.

With most water heaters, the ECO is one-time use device and the gas control valve is replaced.
Some water heaters have resettable ECO, but the overheating problem has to be solved.
Each water heater is different.
Contact Rheem or read manual for correct procedure.

If you have intellivent gas control valve, open following links for typical service manual:
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html#intelli
http://waterheatertimer.org/pdf/Intellivent-service-manual.pdf

More resources:
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

Sep 30, 2011 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Water leakage at lower heater unit of 50 gal.Rheems. Four years old. How to remove and repair?


I believe your water heater could have a 6 yr warranty. If its leaking then you should be able to get it replaced for free. Call the place you pruchased it at and see what their procedure is for returning it. Most places just allow you to bring it back and they will give you a new one. To uninstall, first shut OFF the breakers to the power or shut off the gas. Then shut OFF the valve to the water supply line and if there is a shutoff valve on the other water line line coming out of the heater, shut it off also. Once the water valves are shut off, remove the two water lines from the top of the unit. On the bottom of the unit you will notice a water faucet valve. Attach a garden hose to the valve and run the hose outside on the ground. Open the water valve and your heater will drain through the hose to outside on the ground. Then, with the power OFF, unattach the wires from the junction box or wherever they are attached or if it is a plug, then unplug it. If it is a gas model, unattached the gas line AFTER the gas is truned OFF. Once the water has fully drained from the tank then it should be ready to be moved. Reinstall the new tank in the same manner in reverse.

Mar 29, 2011 | Rheem Water Heaters

1 Answer

I have a reliance 501 propane gas water heater how do i change a thermostate


Hi,

To change a gas hot water heater thermostat you will need to first buy a new gas valve for your hot water heater. The gas vaive and the thermostat are integrated into one unit.

To replace the thermostat on a gas hot water heater you must follow these procedures....

1. Turn off the incoming water and drain the water heater.

2. remove the pilot tube, the burner gas tube and the thermocouple from the gas valve. Turn off the gas line and remove from the gas valve.

3. get a pump pliers or a wrench in behind the gas valve and turn the whole assembly CCW to remove it from the tank.

4. After appliying 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 ECO. They are the little red wires on the back. If you break them the assembly is irreparably damaged.

5. reinstall the gas line, thermocouple, burner tube, and the pilot tube to the gas valve.

6. Fill tank with water. Make sure to open a hot water faucet and purge all air from the tank.

7. Check for leaks where the gas line hooks up with soapy water.

8. Relight pilot light and check operation.

9. Set the new temperature setting to a medium setting and then adjust the temperature to your likeing from there and adequate time for heating completely.

heatman101

Feb 23, 2011 | RELIANCE ELECTRIC WATER HEATER

1 Answer

Need to know where the termostat goes in the waterheter?


The thermostat probe on most residential water heaters is part of the gas valve. The thermostat is a non replaceable part of the gas vale and if your t-stat is bad you will need to replace the gas valve also.
This is generally not a very hard job just start off by shutting gas supply valve to off position.Disconnect main gas line to burner,line to pilot light, and thermocouple from gas valve. Remove pipe fitting from gas valve and use large pipe wrench to loosen gas valve.
Before you loosen gas valve you will need to shut water supply off and drain water from tank.MOST WATER HEATER GAS VALVES ARE PRETTY STANDARD ITEMS AVAILABLE AT MOST HARDWARE STORES. Just make sure you purchase valve for the type of fuel you have,such as l.p. or natural gas.Remove gas valve by turning counterclockwise. Use teflon tape or pipe joint compound on all threaded connections for reassembly. Hook up gas line,burner supply line,pilot and thermocouple lines. Refill tank and check and check for leaks. Light pilot and turn gas control to on. Set to desired heat setting . Also check all gas fitting for leaks. Good luck. Thanks

Dec 17, 2010 | Water Heaters

1 Answer

Pilot will not light


Unable to light pilot Gas supply turned off Turn on gas supply Gas **** knob dial not positioned correctly Check lighting instructions. Set control knob Defective thermocouple Check and replace thermocouple Defective safety magnet assembly Check and replace gas valve Pilot burner orifice clogged Clean or replace Pilot tube pinched or clogged Clean, repair or replace Poor thermocouple connection Check and tighten Air in gas line Purge air from gas line Thermostat's single use ECO is tripped Check ECO and replace gas valve Gas valve defective Check gas valve

Jun 06, 2010 | American Standard AMERICAN STD 100G NGAS...

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