Question about Water Heaters

1 Answer

Gas thermostat fails - Water Heaters

Posted by on

  • colleen_seif
    colleen_seif Nov 01, 2012

    The gas thermostat been replaced twice in the last three months. It is a electronic gas thermostat made by Honeywell. The overheat sensor causes a shutdown and then thermostat has to be replaced. Whirlpool says there is sentiment in the tank. But I have flushed and drained, and the water is clean and clear.

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Water Heaters Master
  • 5,089 Answers

1) If your water heater plugs into outlet, then electronic gas controls are susceptible to power surge. and reversed outlet polarity, and undervoltage at outlet, lack of ground wire continuity between ground plug and manifold tube connected to bottom of gas control valve.

2) If sediment builds up inside tank, it will cover thermostat probe and cause probe to malfunction.
Tank can have sediment flakes build-up and still drain perfectly clean water.

3) There are 2 general types of Honeywell electronic gas controls valves installed on Whirlpool heaters.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
The gas control for atmospheric water heater (passive vent at top of heater) is modular, and is not always removed from tank when replaced.
The other gas control for power vent models is removed completely.

4) Remove thermostat from tank to reveal 3/4" opening.
Look inside tank.
To remove sediment flakes: Tape assorted plastic pipes and tubes to shop vac hose and see if flakes can be removed. And remove drain valve.
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html

5) Check that air intake is clean using feather duster or compressed air, clean combustion parts as shown in product manual. If air intake is clogged with dust, then draft vent is slowed. This causes slowed venting of hot combustion by-product that will overheat combustion chamber.
Typically this condition will trip the FV system. BUT it might also trip the gas control thermostat.
http://waterheatertimer.org/images/Flame-trap-inspection-325.jpg
Stand 3-legged water heaters on bricks so inspection and cleaning flame arrestor screen is ez.

Posted on Nov 02, 2012

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Any idea why my Atwood water heater will shut the main burner and the pilot light off at the same time? Sometimes runs for 20 minutes, sometimes 2. I hear a clicking sound, then they both shut off.


The thermostat shuts off the main burner.The pilot light gas is controlled by the thermocouple which the side of the pilot flame has to envelop. If the flame is too small or too far away from the flame, it shuts the gas off to the pilot. The thermocouple generates a small voltage which keeps the pilot gas open. It can over time fail itself, so look at replacing it. The thermostat sounds like it's failing too.

Apr 27, 2016 | Water Water Heaters

2 Answers

Pop-off operated suddenly on elec ops. Went to LP ops & same problem when water heats. Help!


What you are referring to as the "pop off" is the OVER-TEMP SAFETY DEVICE, which is designed to prevent the unit from overheating (and potentially exploding). It is infrequent that these fail but they sometimes fail. As a temporary measure, lower the temperature on the thermostat to a point below where the over-temp safety is triggered.

May 11, 2015 | Atwood GE9-EXT Gas and Electric XT 6...

1 Answer

Rinnai water heater


It sounds like an internal thermostat failed. I would highly recommend getting a factory qualified repair service to resolve the problem for you.

Jan 16, 2014 | Water Heaters

1 Answer

Have an Atwood Model MPD93756 lp water heater in my RV. It lights fine, but continues running until the water boils & relief valve starts leaking. Have replace the ECP thermostat assembly & Gas Valve,...


Are you 100% sure that new ECO & Thermostat were installed properly, and all surfaces where they make contact on tank are clean? If all is correct there, the thermostat should first cut out the power, then the ECO should thermostat fail. be sure you didn't mix the 2 up when installing them. ECO has higher cut out temperature. Only other thing to consider is pressure in the system may be higher than normal.

Sep 29, 2013 | RTO Atwood Water Heater - 6 Gal LP

1 Answer

Georgie boy


You do not say whether your water heater is gas or electric but in either case there are some basic clues to failure identification. If you have a gas water heater, you should hear the burner ignite periodically. If not, the pilot light or igniter may have failed. If you have an electric hot water heater, the circuit breaker may have tripped, the thermostat may have failed, or the heating element or elements may have failed

May 24, 2013 | Water Heaters

1 Answer

Rheem 21v40


Maybe the TRD has tripped
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
Or gas control thermostat has gone bad, due to failed thermostat or tripped FV etc
http://waterheatertimer.org/How-to-replace-thermostat-on-gas-water-heater.html
Post question on pro water heater forum
http://www.thetankatwaterheaterrescue.com/forums/forum3/
Add a comment

May 21, 2013 | Water Heaters

1 Answer

Pr sw failed to close


Troubleshoot by type of gas control valve
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

Repeated 3 flash on power vented honeywell gas control thermostat means system in lockout.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html

Repeated 3 flash on atmospheric-vent Honeywell gas control valve means temperature sensor failure.
Take apart gas control, and buy temperature sensor if sold separately at AO Smith dealer.
http://waterheatertimer.org/How-to-replace-Honeywell-gas-control-valve.html

Add a comment with more information

Mar 23, 2013 | Rheem 40 Gallon FVR NATGAS Low WATER...

1 Answer

Water boiling out of the pressure relief valve


1) Copy following links for troubleshoot resources:
http://waterheatertimer.org/How-to-replace-TP-valve.html
http://waterheatertimer.org/pdf/How-to-replace-water-heater-gas-valve.pdf

2) Problem indicates bad gas control valve thermostat.
The dial located on gas control, is part of the thermostat on gas water heater. Copper probe protrudes into water heater, and this probe contains the ECO energy cut off and thermostat. Thermostats get out of calibration, or they fail. Replacement should be done by experienced person, otherwise it is relatively simple using pdf link above.

Feb 17, 2013 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Gas not getting to the combustion chamber of water heater


1) Gas control valve might be bad.
http://waterheatertimer.org/pdf/How-to-replace-water-heater-gas-valve.pdf

2) Copy following link to identify gas control valve:http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent
3) Link above has general troubleshoot information concerning each gas control.
4) If FV system tripped due to clogged air intake, then can shut down gas control.
http://waterheatertimer.org/How-to-repair-Rheem-FVIR.html

Less air means slowed venting, but same amount of gas is still burning, which overheats combustion chamber tripping FV system.
Each brand is different: Some air intakes are located on bottom of heater, while other brands, the air intake is located under combustion chamber.


5) Gas control will also fail if thermostat fails and allows tank temperature to reach beyond ECO set point. The ECO is 1-time-use thermal fuse. Replace gas control.

Dec 06, 2012 | Water Heaters

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

Not finding what you are looking for?
Water Heaters Logo

Related Topics:

149 people viewed this question

Ask a Question

Usually answered in minutes!

Top Water Heaters Experts

Donni Steen

Level 3 Expert

659 Answers

Brad Brown

Level 3 Expert

15628 Answers

Gil Shultz

Level 3 Expert

3368 Answers

Are you a Water Heater Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...