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Water temperature thermostat misread

Water temperature is misreading (too high) causing the pool/spa not to heat properly. The system turns the heater off due to the temperature misread.

Posted by chuckm5179 on

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Dale Cobb

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You most likely have a bad water temperature sensor. Replace the water temperature sensor that is probably near the discharge side of the filter pump. That should take care of the problem.

Posted on Oct 22, 2009

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Reliant 40 gallon tall electric water heater replaced both thermostats upper and lower elements flushed tank hot water very hot temp turned down lowest possible keeps tripping reset button what else could...


Problem has to be bad element or bad thermostat.

Test elements for short to ground through metal tank wall:
http://waterheatertimer.org/How-to-test-water-heater-element.html

Make sure factory-installed insulation and cover are re-installed over new thermostats so they do not misread tank temperature.
If problem does not show with elements, then replace thermostats again.

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

Oct 06, 2012 | Reliance & 40 Gal Electric Mobile Home...

1 Answer

I have a six month old Reliance 40 gallon water electric heater,The thermostats keep shutting the heating rods down, leaving only cold to lukewarm water, no matter how much I adjust the thermostat readings...


1) Try changing both thermostats. Thermostats are frequently defective. Don't change 1, change both, using generic parts from hardware or home center or plumbing supply.
Be sure to put-back insulation and cover over thermostats so they are not exposed to cooler air and cause misread of tank temperature.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

2) Next step would be complete 30 minute troubleshoot, that would isolate the problem and give understanding of water heater operation.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

http://waterheatertimer.org/How-electric-water-heater-works.html

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jan 24, 2011 | Reliance Electric Water Heater Thermostat

1 Answer

What else could be causing water to flow from the relief valve/discharge line? I replaced the valve and about 6 hours later it was doing it again. Could my thermostat be bad?


Yes a defective thermostat can cause tank to overheat.
I would replace both thermostats.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

There are two other possible suspects:
1) Factory-installed insulation and covers have been take off tank so thermostats are exposed to cool air and misread temperatures and cause overheating

2) One of the elements is shorted in middle of element and still heating after thermostat is turned off + upper thermostat ECO reset is not tripping because it is defective.

If replacing thermostats doesn't fix problem, then test elements, and/or do complete troubleshoot:
http://waterheatertimer.org/How-to-test-water-heater-element.html
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jan 23, 2011 | Water Heaters

1 Answer

Need to reset at thermostat often. Before and after replacing elements.


I would replace both thermostats.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

There are two other possible suspects:
1) Factory-installed insulation and covers have been taken off tank so thermostats exposed to cool air and misread temperatures and cause overheating

2) One of the elements is shorted in middle of element and still heating after thermostat turns off, plus upper thermostat ECO reset is not tripping because it is defective.

If replacing thermostats doesn't fix problem, then test elements, and/or do complete troubleshoot:
http://waterheatertimer.org/How-to-test-water-heater-element.html
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jan 23, 2011 | RELIANCE ELECTRIC WATER HEATER

1 Answer

Replaced bottom element and both thermosats. the reset button tripped what would cause this to happen


Reset trips when upper thermostat senses high heat event over 150 degrees F.

High heat can be caused by:

1) Element shorted to ground through center of element. Thermostats turn off one leg of 240V circuit. Elements always have 120V available. If element is shorted to ground, it might not trip breaker, and continues to heat using one leg of 240 with circuit completed to ground wire.
Test elements:
http://waterheatertimer.org/How-to-test-water-heater-element.html
http://waterheatertimer.org/How-to-wire-EH40-hot-water-heater-timer.html#120-240

2) Insulation and cover not put back over thermostat. Thermostat exposed to cool air, misreads temperature causing element to continue heating.

3) Thermostat sticking in ON position. I usually replace both thermostats at same time to save another trip.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

4) Shorted wire or loose wire at or near upper thermostat. Check that screws are very tight against copper wire.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

5) One suspect can be eliminated is 240Volt power to heater.
Your heater circuit is good.

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jan 18, 2011 | Rheem Water Heaters

1 Answer

The red button keeps poping causing the hot water heater to shut off. I have to constantly reset it.


The red reset button or ECO or energy cut off turns off power to electric water heater.
The ECO responds to temperatures in excess of 150 degrees F.

Preliminary work:
You can use thermometer to check water temperature immediately after ECO trips.
Compare water temperature against the thermostat setting.

There are 4 things that can cause ECO to trip:
1) Bad thermostat is sticking and letting element continue heating water, or ECO is reading incorrect temperature.
2) Factory installed insulation and cover missing from tank, and thermostat is exposed to cooler air and misreads tank temperature.
3) Element shorted to ground in center of element. This completes 120V circuit to ground which will cause element to continuously heat the water.
4) Loose wire near ECO causing high-heat electrical event.

Solution:
Check for missing insulation.
Check screw terminals for signs of high heat and burning >> tighten screws.
Replace both thermostats using detailed instructions given on link below.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

If the problem continues after replacing thermostats, more troubleshooting is needed:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

For more self-help information about your electric water heater:
http://waterheatertimer.org/Do-it-yourself-water-heater-timer.html

For more help, add a comment and I will respond

Nov 04, 2010 | Water Heaters

1 Answer

Turned the temp for the spa up to 100 but it heated the pool too!?!


If you have automatic valves that switch over to run the spa, make sure that the valves turn completely to where they are supposed to be. Normally it will be about 180 degrees from where they are when in pool mode. If you have to change the valves over manually, make sure they're in the proper position. The only time this can happen is if the valves are not in the right position allowing the heated water to return to the pool. The thermostat on the heater will heat the water to the prescribed temperature no matter how you have the valves set. So if you place it on spa mode, it will heat whichever body of water that is flowing through it to that temp. If you have an automation system, double check the valves. That is probably where your problem lies.

Oct 05, 2009 | Hayward H Series Pool & Spa Heater 400k...

1 Answer

Heater shakes when running


Inside the heat exchanger is a governor valve like a car thermostat and a bypass valve that controls the temperature of the water in it by adjusting the amount of new colder water and heated water circulate in it.. When these don't operate properly they cause your problem get a certified rep to fix.

Jul 19, 2009 | Hayward H Series

2 Answers

Heater will only heat spa water to luke warm.


sounds like it may be the thermostat on the heater. You are correct to check the filter first. if it is clean then it is probably the thermostat

Dec 19, 2008 | Jandy Laars Lt 250,000 Btu Heater

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