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Mend Ferroli Sigma 40 Problem Replaced

ferroli sigma 40 keeps turning off after 15 min?

I have had this problem for a while
i have replaced ntc sensor and overheat stat but to no avail
i tried wiring pump to switched live and this helped in cold weather but problem has returned now that outside temp has risen

frustrated
April 2009
FerroliFerroli Sigma 40Heating, Home Heating Systems40 Problem Replaced

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Ferroli Sigma 40 Keeps Shutting Off - Fixes