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I replaced the lower element last night and had hot water. Tonight I went to use the hot water and it was only slightly warm. Did the top element burn out or did it burn the thermostat out or did it burn the lower element out again? What tests can I do to tell which?

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Remove both elements and check continuity of both units,sometimes also the thermostat can go bad from age,also make sure you have 240volts from main panel in house,if you lose 1 leg i.e. 120 volts the heater wont work properly without 240volts

Posted on Aug 27, 2009

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Posted on Jan 02, 2017

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I have a Rheem 81SV-40D water heater, water is hotter in the morning and only warm at night. I don't see a time or anything. Can you please help me to figure out what's wrong? thanks


Dear Chu,
I think I am hearing you say the water is hotter if the water heater has sat all night without the usage of any hot water, and otherwise, it is not hot.
I should suspect one of your heating elements is not good any more.
Look and see if there are 2 removable covers on the side of the water heater, an upper and a lower.
Take a test instrument and, with the water heater unhooked from the power source, see if you have one element that shows no continuity with an ohm meter /resistance test.
That element can be replaced, sometimes you must drain the water heater water to do so.
God bless your efforts.

Feb 17, 2017 | Rheem Water Heaters

1 Answer

No hot water from my Rheem 72-40-1, I replaced the bottom element a couple of times now in the last 4 months. I replaced the bottom element last night and for the first time opened the top cover to see...


Open following link to look at thermostat wiring
http://waterheatertimer.org/How-to-wire-water-heater-thermostats.html

If you have dual element electric water heater, then that is a 240Volt water heater.
http://waterheatertimer.org/240-v-water-heater-circuit.html

If you are replacing lower element several times, are you also cleaning out the tank?
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html

Are you installing same wattage element shown on label on side of tank: Should be 4500Watts.
http://waterheatertimer.org/Figure-Volts-Amps-Watts-for-water-heater.html

If upper element burns out, then tank will have no hot water:
http://waterheatertimer.org/How-it-works.html
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 while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Mar 05, 2011 | Rheem Water Heaters

1 Answer

HOT WATER LAST NIGHT BUT LUKE WARM THIS EVENING? IS IT AN ELEMENT:


I assume you have electric water heater.
If tank has 2 elements, then it is 240V
If you have Rheem, then elements are 4500 watt.
Check label on side of tank for particulars.
Rheem: second two digits on serial number correspond to year of manufacture.

Ordinary tank type water heater is fully repairable by homeowner using generic parts from hardware or home center.

If you have some hot water, then that says several things:
-Upper element is working.
-Electricity from circuit breaker to upper thermostat is good.
-ECO reset button is not tripped.
-You do not have overheating event.
-Access doors and insulation are in place and thermostat not exposed to cool temperature.

That leaves following suspects:
1) Check if TP valve is stuck open and running all your hot water down a drain.
http://waterheatertimer.org/How-to-replace-TP-valve.html

2) Upper or lower thermostat is bad.
Replace both thermostats for $28
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

3) Lower element is bad -and- maybe tank has built-up sediment
http://waterheatertimer.org/How-to-test-water-heater-element.html
http://waterheatertimer.org/How-to-replace-water-heater-element.html

4) Wire is loose inside tank. Open covers and inspect. Tighten screws very tight against copper wire.

5) Bad wire between upper and lower sections of tank.
Do complete 30 minute troubleshoot before replacing any parts.
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, fixya expert speaks with you over phone while you work on water heater.
We are always less expensive than a service call.

Jan 14, 2011 | Rheem Water Heaters

1 Answer

We installed a brand new Reliance Electric Hot Water Heater, but no hot water, only lukewarm! Replaced top heating element and still no hot water!! Any suggestions as to what we need to do now?


If you have some hot water from dual-element water heater, then that tells us:
Water heater is 240Volt.
Upper element is working. If upper element is not working, then heater has NO hot water.
Reset button is not tripped.
Electricity and breaker to water heater are delivering 240Volts to heater.

Remaining suspects are:
1) Bad upper or lower thermostat: Solution: replace both thermostats for 28$.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html
2) Bad lower element: Solution test and replace element:
http://waterheatertimer.org/How-to-test-water-heater-element.html
http://waterheatertimer.org/How-to-replace-water-heater-element.html
3) Loose wire or loose connection: Solution: open both covers and inspect for burning. Tighten all screws very tight.
4) Bad wire: Solution: Buy cheap multimeter from Home Center and do a 30 minute troubleshoot of entire water heater before replacing any parts:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html
When testing for voltage, rotate multimeter dial to 240-250-277VAC
When testing elements or continuity, rotate multimeter dial to Ohms.

Jan 10, 2011 | RELIANCE ELECTRIC WATER HEATER

1 Answer

Replaced both lower and top elements and upper thermostat still no hot water. proper elec. going to unit.what could it be?


You need to take 1/2 hour to learn basics and then test water heater parts before replacing anything.
http://waterheatertimer.org/How-to-troubleshoot-electric-water-heater.html
Follow the troubleshooting steps, and it will tell you exactly where the problem is.
Otherwise we can guess at 20 different things.

Water heater is 240V because you have more than 1 element.
Did you test for 240V across top two screws of upper element?
Breaker can be tripped off on one leg and 120V arrives at water heater so heater looks like it has electricity, but circuit is not complete.

The problem can be loose wire, bad 240V circuit breaker, sediment reaching lower element, bad thermostat, bad upper element, tripped ECO reset button.

Did you replace factory insulation and cover over thermostats after replacing elements?
Did you vacuum out sediment when replacing lower element?

How long ago did you replace elements? If you turned power ON before tank was completely filled with water, then you burned out the element. If upper element is burned out, the tank has no hot water, even if lower element is good.
Test the upper element:
http://waterheatertimer.org/How-to-test-water-heater-element.html
See how a water heater works:
http://waterheatertimer.org/How-it-works.html

And finally, why so many folks write to fixya saying they replaced both elements and upper thermostat, but they never replace lower thermostat for another $6? I have been puzzled about that since lower thermostat turns on and off each time tank temperature drops and is responsible for keeping water warm during standby hours. Lower thermostat cycles more times than upper thermostat.

Add a comment if you need specific assistance with any of the testing steps.

Dec 14, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

I replaced the heating elements(2) and switiches(2) on my Rudd electric hot water heater. Model PES 40-2. The switghes came with several wiring diagrams.(universal) Can I get a diagram specific to my...


Residential water heaters USUALLY follow same diagram unless water heater is wired for other purpose. Multiple diagrams on instructions show available options. Take photo of wiring before removing wires on any electrical device.
Upper element.
Black wire from top of heater connects to #1 top left screw.
Red wire from top connects to #3 top right screw.
Blue wire from upper element connects to #4 middle screw on right side
Red wire from lower element connects to #4 middle screw on right side
Yellow wire from upper element connects to #2 lower left screw
Black wire from lower thermostat connects to #4 lower right screw
Upper element: Yellow and Blue wires connect to either screw
Lower element: Red wire from top connects to either screw
Lower thermostat: Black wire from top connects to top screw
Short wire between lower thermostat and lower element

http://waterheatertimer.org/images/Water-heater-wiring-w-numbe.jpg
http://waterheatertimer.org/images/Thermostats-numbered-divided-500.jpg
http://waterheatertimer.org/How-to-wire-water-heater-thermostats.html

Sep 18, 2010 | Whirlpool Water Heaters

1 Answer

Warm water only


You can eliminate the shower control knob possibility by turning on your hot water anywhere else in the house. If you get hot water in other places, then it could be the knob causing it. A substantial lime buildup in the tank can also cause poor heat transfer from the elements to the water.

Sep 16, 2009 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Elements in convection oven won't heat


DO you have a model number for that. I'm almost sure it's a thermal fuse in the back of the oven. Usually they go out during or after cleaning but that would shut down both elements. If you have the model (usually by the inside door look all over and up in the cavity) Then if you go to this link

http://www.searspartsdirect.com/partsdirect/index.action?intcmp=xsite_Sears

It will show you a breakdown of the oven and where it is. If you give me the model I'll show you what I'm talking about. Good luck.

P.S. if it the fuse it's a cheap fix, little hard to get in back of the oven but cheap!

Mar 04, 2009 | GE Ovens

1 Answer

My water pipes froze thursday night so friday night when i went to bed i left the tubs hot water turned on and they thawed out about 2am i got up and turned the tub faucets off the water was hot at that...


you probibly ran the hot water tank out of hot water shut off the hot water comming out of your fausets for a few hours and check it again u could also try to reset your tank by pulling off the front cover and hitting the reset button and my last thought is sadly you burnt out your heating elements and they need to be replaced good luck man

Feb 28, 2009 | Rheem 80 GAL ELEC TALL Water Heater 6YR SC...

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