Here s the most likely problem.
Electric hot water heater thermostat reset button.
To reset it you ll need to press the red reset button on the eco which is usually attached to the upper thermostat.
The high limit switch is bad.
Some tanks have two thermostats and two reset buttons.
The hot water heater reset is actually a high limit safety thermostat switch that disconnects the power to the water heater if the water exceeds a preset temperature.
An electric water heater reset button is positioned above the thermostat which is behind a panel on the front of the tank.
When a water heater starts tripping the eco repeatedly it s time to call a plumber for service.
The water in your water heater is getting too hot.
Other reasons for a hot water heater reset button to trip.
When the button trips you reset it by pushing it in.
Thermostats aren t the only parts on an electric water heater that can wear out and trip the reset button especially if you re finding you have to reset the water heater frequently or you run out of hot water fast and often.
So the red reset button on your electric water heater keeps popping out and needing to be reset.
If it won t stay in it may mean that you have to make repairs.