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Error E02 indicates that the water temperature exceeded high limit.
Switch off the house circuit breakers dedicated to the water heater and then press the reset button located behind the control panel on the water heater.
IF the bottom of the burner chamber is weak from the heat, it would be best to replace the entire unit. There is no one qualified to perform that repair due to liability reasons.
Hatco booster heater typically has 2 sets of thermostats and elements located on each end of heater. Both sides might be controlled by same 60 amp breaker, or the heater might be controlled by two separate 30 amp breakers. Be sure you have correct wire and breaker.
After reading steps on link above, add comment and say if this is new installation, or older installation that suddenly started throwing breaker.
Tankless require yearly maintenance as outlined in manual. No tankless manufacturer suggests do-it-yourself repairs on their product, in part for liability and danger to customers, but for long-term customer satisfaction. Repairs and yearly maintenance will eliminate the $1-8 monthly energy savings expected from owning tankless.
What you need to do is replace it once thay start leaking there no good you need to tern the cold water off going to the water heater drain about five gallons and replace it make Sher you use plenty of pipe compound.
An internal short in the wiring of the thermostat. It is not as common an occurrence as it use to be, but it still happens.
I would check your breaker panel and make sure the water heater's breakers are the correct size for your unit.
if you turned the breaker to the left to turn off you must turn the breaker all the way to the right to reset it same as if you turned to the right you must turn to the left all the way to reset which ever way you turned the breaker off you need to follow thru the process in order to reset that breaker breakers are spring loaded flip it completly off than on
I had the same problem with the Stiebel Eltron Tempura 24. Right side unit worked (with blinking LED), but the display and left side (including LED) did not work.
This is CRITICAL. Do not take the cover off unless you have turned off circuit breakers at the circuit breaker panel AND tested that there is no power. There is a lot of voltage/ampreage here and it could be life threatening if you get shocked. Call an electrician (or a plumber) if you don't know what you are doing.
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