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Mend Biasi Dhw Ch Cold

my biasi boiler is working on dhw, but on ch it is working very slowly?

my biasi boiler is working on dhw, but on ch it is working very slowly, the returns are cold, the ch system seems to be ok, can it be the bypass valve filter or the divertor valve .the boiler is running, ie cuting in and out within the temp range etc.

John B
February 2009
BiasiHeating, Home Heating SystemsDhw Ch Cold
found a blockage in the returns now ok

John B
February 2009

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