Diagnosing and handling a problem will depend on whether your unit is gas or electric powered.
When you experience any water heater problem, the first thing to do is to check the power supply. In many cases, power supply issues are the cause of water heater problems.
If you aren’t comfortable doing it yourself, you can call your electric company to do it for you. In some cases, they will do this at no extra charge.
However, if you’re feeling confident, resetting your electric water heater temperature is fairly easy.
You should make sure not to use any hot water for at least two hours prior to resetting the temperature. Before proceeding, turn off all water and power to your system.
Your electric system will probably have two thermostats, so make sure both are set at the same temperature.
There should be instructions provided on your unit showing how to properly adjust your thermostats. To get to them, you’ll need to remove the upper and lower access panels.
Once done, turn the power and water back on. Use a meat thermometer under a faucet to check that the water is now at an acceptable temperature.
Thermostats on gas systems differ with each unit. Call your gas company for special instructions or consult the owner manual to make sure you adjust it correctly.
When you’ve set the thermostat to an acceptable temperature, check the water coming from your faucet with a thermometer before use.
Regardless of your energy supply, If adjusting the thermostat does not resolve the problem, call in a professional.