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Mend Ferroli Optimax 31he Boiler Hot Water

i have a faulty boiler can you help?

ferroli optimax 31he. hot water ok but heating comes on and only stays on for only 8 mins. have renewed diverter valve but still heating only stays on for 8 mins. any ideas?

i.d.
October 2010
FerroliFerroli Optimax 31heHeating, Home Heating SystemsBoiler Hot Water

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