It is boiling the water. Turn it down. Look on the side and remove the small cover to expose the thermostat Turn it counter clock wise to reduce heated water temp.
There may be two.
After an hour or so test the hot water and see if you can keep your hand in the flow of all hot water. If it
is so hot it will burn you it is still too hot. 170 is hot enough. That is slightly painful and will cook the skin
SOURCE: Rheem 50 Gal Hot Water Heater will not stay lit
On the back of the gas valve (where you turn the temp up) there is a stem that actually goes into the tank that senses the temprature of the water it could be dirty or buried in sediment depending on how old the tank is, or just bad. if the tank is over 10 years old i wouldn't bother replacing the gas valve, the tank is probably not far behind. A new valve will run around $100.00 maybe a little less. You wont find it at menards or home depot in stock but they may be able to order it for you. Menards sells rheem products or try you local plumbing supply house. REMEMBER TO RELIEVE THE PRESSURE ON THE TANK BEFORE YOU WORK ON IT. IF YOU CHANGE THE VALVE DRAIN IT FIRST!
SOURCE: Rheem water heater turns off by its self
Flashing code 76 is lost communication between the remote and the burner control assembly CCA (circuit card assembly). The CCA is still under warranty if purchased within the last 3 yrs. Contact Rheem customer service and have your Mod. and S/N available....explain to the agent you are recieving - flashing code 76...they'll walk you through the process.
SOURCE: water heater makes a constant hissing noise with power on or off?
You have a water leak under the house, but need to know if it's a gas heater or electric. check the Pop off valve on top of the tank it has a short handle and should go threw the floor pull up on the valve and let it sit back down, if it stops the high pressure pop off valve is leaking, you can buy it and replace it for 5 or 10 bucks, if that does not stop it look under the house. Also use a broom stick and put the round end at the wall and the other end near your ear and check the wall and floor for the noise the closer you get the louder the sound. Hope this helps. If you look under the house and see water you know you got a leak in the pipes or the tank itself.
SOURCE: Rheem water heater Model 81v40DT
It sounds like the pressure/temperature relief valve is stuck open slightly, and draining out the PVC pipe. This is common in poor water locations.
You can try lifting the release on the top and letting it pop shut again, but chances are good that by now the seat has been destroyed by the water passing over it. Replacements are available at any home store, just remember to drain the water out of the heater so you don't flood the garage. MAKE SURE YOU TURN OFF THE POWER FIRST OR YOU WILL BE REPLACING THE ELEMENTS ALSO! You will need to wrap the threads with teflon tape before installing the new valve.
SOURCE: rheem gas tankless water heater with error code c4 13
problem is inside burner compartment o2 sensor dirty or block..need to have a qualify technician clean it.
heatman101
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