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Hot water system is not working- producing cold water. could it be a thermostat or is it to be replaced?? not sure how old but would guess 10 yrs +

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Resourceful do-it-yourselfer can add a comment with type, make and model number of product for best answer.

1) Open following link if you have electric tank-type water heater, for tested, full service do-it-yourself diagnosis.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html
Open top cover and push in ECO reset button:
http://waterheatertimer.org/images/Jly-022-thermostat2-175.jpg
Find age of water heater using serial number located on label on side of tank:
http://waterheatertimer.org/pdf/WaterHeaterSerialNumberDecoder.pdf

2) If you have tank-type gas water heater, thermostat is connected to gas valve, but you might have question about gas flame instead of thermostat.
Check manual, check flame, buy new gas valve at local home center.
Following link shows typical gas valve with brass thermostat:
http://waterheatertimer.org/images/316938_603.jpg

3) If you have tankless electric or gas, the problem can be varied from internal to external causes.
Check manual, call service technician.

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.

Posted on Mar 14, 2011

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Posted on Jan 02, 2017

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I have a Reliance 501 HWH, 15 yrs old. Nary a problem until now. Yesterday, HW was very hot. Today, no HW. I'm thinking of replacing both elements and thermostats due to the age. Sound reasonable?


At fifteen years of age it would be less cost over time and labor to replace the whole tank. How efficient is your old one and being it runs hot all the time you could have a tank that will not last very long anyway. Mine sprung a leak at 18 years and made a big mess.

May 15, 2014 | Reliance Water Heater #6-50-DJRT 50GAL...

1 Answer

Water heater


Guessing that you have 240Volt residential non-simultaneous electric water heater? And that you have 30 amp breaker and 10 gauge wire. And that water heater is located within 100 feet of breaker box. And there are no leaks running hot water out of tank. And that you installed fully brand NEW elements of same wattage as old elements. And that fully brand new thermostats were installed, and wiring exactly duplicates wiring that was present before. And that factory-insulation was re-installed over elements and thermostats.

1) Guessing the 'hot water shut off' means the ECO red reset button located on upper thermostat keeps tripping and cutting off electric power to water heater?
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html
http://waterheatertimer.org/images/WH-w-combined2-1000.jpg
http://waterheatertimer.org/How-to-test-water-heater-wires.html

2) If the ECO is tripping, then water is getting too hot, or there is shorted wire located near the upper thermostat, .
Typically replacing both thermostats and replacing elements will solve this problem .... assuming that new thermostats and elements are good, and wiring correct.
Double-Check your wiring on upper and lower thermostats.
Test wires for short.
Make sure factory-insulation is re-installed over thermostats so cool room temperature will not affect temperature reading.
Check that thermostats sit flat against steel tank.
Many short draws hot water can also cause stacking event that will trip circuit breaker.

3) Add comment and say what you find using checklist above.
Be careful to explain findings fully, using same words found on links above, so illuminated diagnosis can be made.

Dec 28, 2012 | Water Heaters

1 Answer

Hotwater heater new won't heat??


Is water inside tank Hot?
Open TP valve and also open drain valve.
If tank is hot, then you might have plumbing problem caused by bad faucet cartridge or check valve.
http://waterheatertimer.org/Crossover.html

Red reset button is located on upper thermostat.
Test for 120Volt across top two screws on upper thermostat.
You might have a bad upper thermostat.
If electric water heater has some hot water, then upper element is good.
Electrician should enjoy following page full of information.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Are the hot and cold pipes reversed on top of tank?
Usually the cold water line has shut-off valve.
Top of tank is marked H and C
http://waterheatertimer.org/How-it-works.html

Aug 23, 2012 | Whirlpool Water Heaters

1 Answer

No hot water


test the thermostat and the heating elements --also there are resets that can pop push and make sure they have reset

May 17, 2017 | Water Heaters

2 Answers

I have a 40 gal electric water heater, but have insufficient hot water. The cold water intake pipe on top of the heater is very hot but when I turn on a hot water tap, it gets cold quickly. replaced dip...


You will need an amp meter. I suspect that the lower heating element is out or the thermostat.

Most water heater have a upper and lower element. The bottom is the main work horse.

Take the lower access door off and you can get to the wires to use a clamp on Amp meter. You should get a reading of 10 + amp if it is working. You can check the thermostat with the volt meter also to make sure you are getting voltage to the element . You should have 220 volts across the two wire attached to the element. The elements are not to hard to change. You will need to shut the power Off and the Cold Water off. Drain the tank to get below the bottom element and you will need to get a special wrench to unscrew the old element out of the tank. Hope this Helps

Jan 02, 2011 | RELIANCE ELECTRIC WATER HEATER

1 Answer

Temperature in shower too hot. what need's to be


Hi, its probably just the filter to the cold supply needs cleaning; these can get clogged from time to time. Turn your water off, remove unit, unscrew the water pipes which should be the silver flexi type and washout the mesh filters.
Hope this has helped.

Jul 25, 2010 | Grohe Grohmix Thermostat Valve & Trim -...

1 Answer

Storage hot water system sounds like its crackling when filling after water use.system is 7 yrs old


check your thermostats and see if they are set to highest setting. Sometimes if theya re they will pop and crack when filling back with cold water.

May 17, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

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...

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