Water Heater Reset Button

I got up on schedule, just to find that there wasn't any hot water!   Everything check out OK for the water heater..... that we could find!   So, I called Stan's Refer and Repair Service and ask if they could check the elements.... .. they then ask me if I had pressed the reset button on the water heater?! What reset button, I ask??? Well, come to find out that under the upper front cover on my water heater there's a little red reset button...... .. nope, I never saw it, nor pressed it, nor did I know about it...Posted by: "NancyC"