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Mend Vaillant 628E Home Heating

I have a Vaillant thermo compact plus 628E ?

Please can any one advise me on what I can do with a F23 fault on the boiler.
Done flush and changed the pump!!!
Please please.
It comes on/off then after with fault code F23

Pj
June 2013
VaillantVaillant 628EHeating, Home Heating SystemsVaillant Home Heating
blockage is system need power flush ,or add cleaning agent in system F23 pump out put is too low also clean NTC

ltd
June 2013
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