I need the rheem model rbha-17j11nfdai wiring diagram for a new thermostat

There is usually one pasted to the back of the access panel cover & some are on the thermostat. Worst case scenario. Go to Lowes or Home Depot, there may be one on the packaging of the replacement thermostats in the plumbing department. Good luck.

What temp do you have the thermostat set to? Normally, we set 140 degrees f

Replacing a heat element in this model is a good idea if it's bad.. Otherwise I would suggest changing the part that is defective. ;-)

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/perry_14036f9bc71cde6a

You have dual element 240Volt tank-type electric water heater.
You want to change wiring from non-simultaneous to simultaneous.
Copy following link for exact internal wiring diagram, and external wiring change: Remember the wire from breaker box will not support both elements without tripping breaker, so you will need additional 30 amp breaker and 10 gauge wire, or single 50 amp breaker and 6 gauge wire.
http://waterheatertimer.org/How-to-wire-water-heater-thermostats.html#simultaneous
http://waterheatertimer.org/Color-codewire2.html
http://waterheatertimer.org/Figure-Volts-Amps-Watts-for-water-heater.html

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

I can't identify that model number, and Rheem does not show that model:
Open following link to help identify water heater:
http://www.rheem.com/Products/tank_water_heaters/gas_water_heaters

Contact Rheem:
http://www.rheem.com/Contact.aspx

Contact Rheem/Paloma if plumber was unable to repair problem:
Open following links for Rheem tankless resources including Rheem chat and phone support:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://www.rheem.com/products/tankless_water_heaters/customer_support/

http://waterheatertimer.org/How-to-wire-water-heater-thermostats.html
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html
http://waterheatertimer.org/How-water-heater-thermostat-works.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.

You have electric water heater.
Electric water heaters are fully repairable by homeowner, excluding hybrid type.

Rheem electric water heaters:
http://www.rheem.com/products/tank_water_heaters/electric_water_heaters/
Rheem fury series manuals and models
http://www.rheem.com/product.aspx?id=09DF2BDD-5E11-4D32-B574-84ACFB8A4619

Age of Rheem water heater is shown first 4 digits of serial number located on side of tank: for example 0705 means July 2005.
Serial number also shows model number & wattage of elements in case you need to buy new generic 4-bolt type 4500 Watt element from hardware store.

A) If your water heater receives very cold incoming water, it may not heat fast enough to keep tank warm.
Add a tempering tank.
http://waterheatertimer.org/Tempering-tank.html
Add insulation over entire water heater except TP valve. Insulate pipes completely.
Read more information:
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html

B) 40 or 50 gallon water heater is 240Volts and tank will have 2 access panels on front.
Rheem ships all water heaters with 4500 Watt elements.

Narrow down the suspects:
C) Water heater has some hot water.
This tells us upper element is working.
And that water heater electricity is working.
And that reset button is not tripped.
And that heater is not experiencing run-away overheating event.

That gives us 3 solid suspects.
1) lower element is burned out. Test lower element using inexpensive multi-meter from Home Depot.
http://waterheatertimer.org/How-to-test-water-heater-element.html
Replace element with same wattage shown on label, and clean out sediment:
This will restore water heater to full 99% efficiency.
http://waterheatertimer.org/How-to-clean-sediment-out-of-electric-water-heater.html
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html

2) Upper or lower thermostat is bad. Replace both thermostats for about $25.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html
If you want to test thermostats and all parts before replacing anything:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

3) Burned or shorted wire. Turn off power. Open covers on side of tank. Remove insulation. Inspect parts for signs of high heat and burning. Especially lower element. Tighten any loose wires. Replace part that shows signs of burning.
Put insulation and cover back over thermostats so cooler outside temperature doesn't cause thermostat to misread tank temperature.

Rheem 4500 watt element

If you have to keep resetting it the thermostat maybe going bad. They are not to costly maybe around $15 dollars.
Inspect the element's wiring and make sure that it look's intact and no burnt look to it. They can short out and trip the reset button also.
Turn power off and disconnect the thermostat one wire at a time and reconnect to new one. You could draw yourself a diagram of th ewiring pattern to make sure you wire it back up correctly.