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Mend Protherm Boiler Happening Time

my boiler keeps cutting out and showing F0 in lcd window?

this is happening every time i go to use water. However it will let me reset by turning boiler off at the switch under boiler. I have the added problem of having no manual so not sure what model of protherm boiler i have. Can anyone help pls?

layne
September 2009

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