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Mend Ferroli HE 31 C Heater Water Heating

How can I fix my heater optimax he 31 c?

Hot water is fine.There is no error message.The heating temperature increases quickly with a flame icon on the right which disappears after a few seconds then the display switches to d2.ferrroli he 31 c

Stanley
June 2013
FerroliFerroli HE 31 CHeating, Home Heating SystemsHeater Water Heating

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