Question about Reliance & 40 Gal Electric Mobile Home Water Heater

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My dad lost the manual to his 606 Model # 640DORS. We can't figure out where you change the temp.; the person who installed it several years ago, turned the temp. way down, and in the winter, it doesn't cut it for showers, dishes and laundry. It can take 3 hours to do dishes and get in a couple of showers. We need to turn the thing up! Thanks for your help.

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Remove access door usually on upper side of unit. Will need to unscrew retaining screws. Under cover is a thermostat that you can adjust to your liking. Reattach cover when done.

Posted on Sep 06, 2010

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Posted on Jan 02, 2017

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End of my rope, tried everything I can think of.


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How to change thermocouple on model 640YORT


I believe that is a Reliance 606, ehow has instructions on how to change the thermocouple.
http://www.ehow.com/how_6579030_change-reliance-606-thermocouple.html

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The reliefe valve opening on my reliance 606 gas water heater is hissing. what could be wrong?


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Press reset button.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Add comment and describe water heater, and more detail about problem

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I have a 640dors reliance capacity40 water won't stay hot long(electric)


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your thrmostat has been short circuited, replace it immediately and plz dont use the heater before you replace the thermostat of u r machine....its dangerous!!
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How to change a thermostat on reliance 606 hot water heater. water is getting too hot and there is no sediment build up. also water heater is only 4.5 years old.


I wrote a page for changing water heater thermostat.
The photos take you through step-by-step
I recommend replacing both upper and lower thermostats so it eliminates thermostats as possible cause if water heater keeps overheating.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

The Reliance 606 manual shows your water heater uses generic upper and lower thermostats from hardware store.
http://www.reliancewaterheaters.com/lit/om/manuals/185761-000.pdf

Likely the thermostat will solve the problem:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

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