The information about which I will tell will be useful to plumbers, as well as to owners of electric water heaters.
Background: Recently a relative called, he lives in a private house. There is a small hot water heater in the kitchen, which refused to work six months after installation.
First of all, the owner of the house and his son-in-law decided to check the condition of TEN. And in truth, after pulling out the heating coil, it was covered with a thick layer of scale. In addition, there was a large amount of "deposits" in the tank. The fault is hard water from the deck.
After rinsing the tank and cleaning the TEN, they assembled the water heater in the reverse order. Unfortunately, the equipment refused to work. It was necessary to ring the spiral, but they did not have a tester at hand.
After all the manipulations, they contacted me and invited me to fix the problem.
Diagnostics of the water heater
Arriving at the facility, the first thing to do was to drain the water from the tank. Since the drain valve is not provided in the scheme, I had to unscrew the hoses and press on the bypass valve, draining the water into the sink.
After emptying, I removed the hot water equipment from the wall. I opened the cover of the electrics block and the heating coil rang.
She was serviceable. The next in the chain was the performance of the thermostat. It was working correctly, disconnecting the power supply ...
I decided to take a closer look at the thermostat located in the tank body:
And you know what I saw there, the microswitch. "Bump" sticking out of the thermostat housing.
It turns out that the manufacturers of the water heater protected the ten from overheating, if the amount of scale increases critically, the thermostat overheats and disconnects power from the entire device. Even the indicator goes out. In this case, it is necessary to wash TEN from deposits. Collect the water heater, but first pressing the microswitch. Thus, starting the device into operation. The owner of the house did not know about this tricky button. Now he is in the know, as well as you, the readers of the article.