When it comes to your water heater, it's nice to know a quick fix to hold you over until a professional can repair your system. Be sure there's no gas or electricity running to your appliances when attempting a fix. Here are some steps you should try to get your unit back up and running: If your unit is run by gas, ensure that the pilot light is on. If it's out, ensure you have enough natural gas supply. Follow the directions on your tank to relight the pilot light. If your unit is electric, locate the reset button on your unit. Reset the unit to see if that fixes your problem. Ensure the valve connected to your system is all the way open. If you notice mineral deposits or sediment clogging your system, you can flush it with a hose.