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How to test electric water heater thermostats

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  •  Mark
    Mark Dec 08, 2012

    Website was excellent....just what I wanted. Thanks!

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1) Copy following links:
http://waterheatertimer.org/How-to-test-water-heater-thermostats.html
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

2) There is no reliable way to test electric water heater thermostats.
This is because testing requires rotating the temperature selector, which may cause stuck-thermostat to temporarily unstick. So thermostat appears to work normally.
Moreover, thermostat come out of calibration over time, and the temperature selector might be on 125 but tank temperature at 100, and there is no specific way to measure calibration.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

3) I think it easier to replace both upper and lower thermostats to eliminate them as suspects when diagnosing wide-range of electric water heater problems.

Posted on Dec 08, 2012

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Posted on Jan 02, 2017

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Related Questions:

1 Answer

How do i test themastat?


There is no reliable test for electric water heater thermostats
Replace thermostats and see if problem persists
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

Gene

Jul 02, 2014 | RELIANCE ELECTRIC WATER HEATER

1 Answer

Not enough hot water ge smartwater water heater electric


1) Test elements:
http://waterheatertimer.org/How-to-test-water-heater-element.html

2) If elements test out ok, then replace both thermostats. There is no reliable way to test thermostats.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

3) No leaks is good news. Inspect for leaks is important step for longevity of water heater.
http://waterheatertimer.org/How-to-maintain-water-heater.html

Mar 12, 2013 | Water Heaters

1 Answer

No hot water and I have pressed the reset button.


If water heater has no hot water, then that leave 3 main suspects.
1) Electricity from breaker to water heater is not delivering 240V to water heater. Open link and follow troubleshoot.
http://waterheatertimer.org/Test-electricity-to-water-heater.html
2) Upper thermostat is bad. Replace thermostat.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html
3) Upper element is bad. test and replace thermostat.
http://waterheatertimer.org/How-to-test-water-heater-element.html

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

Feb 21, 2011 | Whirlpool Water Heaters

1 Answer

Circuit breaker in water heater will not reset.


If I understand correctly the red reset button or ECO located on upper thermostat will not reset.
Add a comment if problem is different.

Electric water heaters are fully repairable by homeowner.
If circuit breaker to water heater will not reset, then you need full troubleshoot using inexpensive multi-meter from Home Depot::
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

If reset button will not reset, then two things can cause this problem.
1) Ground short between upper thermostat and upper element, including shorted upper element.
a) Look at wires to see visible signs of high heat and burning.
b) Test upper element for short.
http://waterheatertimer.org/How-to-test-water-heater-element.html

2) Upper thermostat is bad. Test upper thermostat, or just replace thermostat using generic upper thermostat from hardware store.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

3) If problems persist:
Troubleshoot electric water heater using inexpensive multi-meter from Home Depot:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html


Upper thermostats are generic unless you have "energy-smart" water heater that has control box and reset button located on top of tank.
geno_3245_119.jpg

Nov 29, 2010 | RELIANCE ELECTRIC WATER HEATER

1 Answer

My water is not heating in my Rheem 40 gallon electric. I pushed the reset button, but when I turn off the breaker and then on again, I do not hear the elements heating up.


Electric water heater can be repaired by homeowner
If I understand correctly, water heater is producing no hot water.
Reset button clicks in, but still no heat.

Three initial things can be causing this:
1) No power to water heater. Test across top two screws on upper thermostat for 240V. Red and black wire are attached to these screws. Screws are marked 1 and 3. Upper thermostat is same that has reset button. If power tests 120 across screws, then breaker may be off on one leg. If no power, then start testing at breaker.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

2) Upper thermostat is bad. Replace thermostat with generic upper thermostat available at hardware store.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

3) Upper element is bad. Test and replace element using Rheem 4500 watt element available at hardware store. Image shown below. Look at label on side of tank for element wattage. Rheem puts 4500 watt elements into all their 240V electric water heaters.
http://waterheatertimer.org/How-to-test-water-heater-element.html

If upper element is burned out the tank will not heat any water.
http://waterheatertimer.org/How-it-works.html

Rheem 4500Watt element
geno_3245_98.jpg

Upper thermostats are generic and interchangeable:
geno_3245_99.jpg

Nov 23, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

No hot water


Electric water heater can be repaired by homeowner.

Four things can cause NO hot water:
1) ECO red reset button tripped. Remove top cover on water heater, push red reset button on thermostat. Put insulation and cover back over thermostat.
2) Circuit breaker is tripped, circuit breaker bad, or wire loose in breaker box. Turn breaker on-off and listen for crackling or fizzing sound, and burned smell. Test breaker for 220Volts. Test top two screws on upper thermostat to see if water heater has electricity.
3) Bad upper thermostat. Replace upper thermostat.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html
4) Bad upper element. Test upper element.
http://waterheatertimer.org/How-to-test-water-heater-element.html

Nov 22, 2010 | Reliance WATER HEATER CO #9-40-DKRT 40GAL...

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