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Mend Ferroli Optimax HE31 Boiler Starts

How can i get rid of the squeeling sound from ferroli optimax he31?

whenever the boiler starts or the heating is on, the boiler makes a squeeling sound. only get rid of it by switching on the hot water tap. any other suggestions?

nik
October 2010
FerroliFerroli Optimax HE31Heating, Home Heating SystemsOptimax Boiler Starts

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