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Is this a wireless system, meaning no wires between the thermostat and the boiler? If so, check to see if the code buttons have been reset. If this is a hardwire system, the relay on your control board may be stuck. In any case, you can always shut off the boiler by turning off the gas and/or circuit breakers.
Best solution would be to change out the thermostat it could cause problems if by chance you do get it to reset. Something goes wrong and it want trip the reset it could cause a fire, so the safe thing to do change it out.
replace the thermostats, be very careful!!!! thats 220volts for elec water heaters, 220volts kills you if you touch it wrong,.....it is one thermostat but it's best to match them, so you'll need both,...not expensive. good luck, cracklin joe
thermostat on the gas valve needs to be replaced,, which you will probly have to change the hole gas vale ,, check on the parts and labor and if it is over 6 years old wheigh the diffrence between it and a new unit good luck
You have a limit switch that needs to be reset. It is probably the roll out switch that is located on the burner housing. The limit switch is a disk about the size of a dime or penny and has two wires to it. There is a small button in the middle of these two wires. Press this button firmly to reset it. Look for all the limits that may be on the unit that is manual reset like the one described above and do the same. This should correct your problem.
Sounds like you have a faulty thermostat. This is the unit that detects the water temperature, and if it is not where it is set, will kick the switch to allow electricity to flow to the elements you replaced. The thermostats are relatively cheap and if you have the knowledge to change the elements, changing these thermostats should not be a problem.