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Mend Vaillant Eco tech plus f74 Heating Fault

My vaillent Eco tech plus boiler f74?

My boiler has a fault reading f74? Any idea of what this could be as the hearing and hot water is not running

Lauren
January 2014
VaillantVaillant Eco tech plus f74Heating, Home Heating SystemsVaillant Heating Fault
Water pressure sensor is faulty ,also that pump is working or not ,see no lose connection to pump and sensor,if both OK than blockage in pipes

ltd
January 2014

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