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SE code on the boiler?

I can reset the code my self but I need to know if the boiler can be on while I am doing it or does it need to be off ?

thank you for your reply
Claudine, November 2019
Making the assumption that your boiler is a Worcester Bosch, the SE code is not a fault that requires resetting. SE means that the boiler is due for its service and comes on after a set time period. If for any other reason the boiler needs resetting, the reset button is pressed and held for a for a few seconds whilst the power is on, there is no need to disconnect the power.

Rupert, November 2019