50 gal. kenmore elite hot water heater model#153.332640 installed 05/01/2011 in February 0f 2017 it started blowing water out of relief valve. temp at faucet 145degrees . rplcd gas contr valve/therm

SOURCE: Relief valve constantly releasing water.

lower your thermostats a bit. If your temperature is set to the hottest setting, then chances are no relief valve will do

SOURCE: Whirlpool energy smart water heater

Two flashes means that the high limit temperature has been reached. Once this happens, the temperature control system will shut off. Make sure that all element access doors are in place. Push the "Push to Reset" button to restart the temperature control system. The water heater will self test for ten minutes before it will start to heat. If you get the 2 flashes again then you may need to replace one or both elements. Each element should measure 5-25 ohms.

The "thermostat" is the knob marked "Temperature Control". Make sure that the operating mode is set to 1,2 or 3.

SOURCE: Eractic Power Vent Gas Water Heater

Th epproblem you are most likely have is from a safety called a flag switch usually located either in the blower or right past it. When you unplug and replug you reset the switch. Sequence of events.  1 fan comes on. 2 switch is made from the airflow of the fan.  3 ignitor come on 4. main gas valve opens and ignitor starts flame. 
You are being stopped at step 2 when the fan does not move with the air. This shuts off and out the water heater from calling again.  Find the fan switch and make sure it moves easily. They get dirty and also dry from lack of lube. Good luck.  

SOURCE: Water Heater Keeps Going Off

Modlara, it's partially true. There is a flow control valve in the heater. In case the intake is too cold or water usage is too high this valve reduces flow volume to maintain output temperature. But not shut off the flow entirely. Too bad, 063 does not come with a remote control, otherwise it could tell you what went wrong. My guess is either the air intake or vent are some how blocked. The heater is having problem generate enough heat to keep up the temp. so the flow control valve kicks in.

SOURCE: Rheem 83xr52-2 50 gal residential water heater.

You can open the top up again. I would not turn the temp higher than 130 degrees, maximum. However, there should be above the thermostat a red button. This is where the power wires connect to the thermostats and heating elements. Sometimes this button needs to be reset, press it and discern if you hear a click sound. This means that the high temperature safety switch has tripped open and you had to manually "reset" it. There are two thermostats by the way. The water heater usually works this way. There are two thermostats and two heaters. The upper tank heater turns on first and it heats the top half of the tank. Then when the thermostat above is satisfied it then allows the bottom heater to come on and heat the bottom half of the tank. You might want to set the bottom heater thermostat as well. This is made this way because it is actually faster and more efficient to heat the top half first and the bottom half secondly. Try this first with the reset button. We could check voltages, but that requires a level of knowledge and safety that I am not sure that you are comfortable with. Pictures of the upper and lower thermostats and connections will help if the "reset" does not do the trick. By the way, not meaning or implying anything, but did you move the thermostat in the right direction? Sometimes the dials can be confusing.