Vaillant Ecotec plus 824 Running Hot and Cold


Postby mikezoe65 » Tue Feb 04, 2014 4:06 pm

A 3 year old Ecotec plus 824 Vaillant has developed the following- when running hot water to the bath or sink the water will pretty quickly run hot but after a minute runs cold for a while then runs hot again and repeats. Can anyone diagnose the fault and indicate what repairs/settings needed. thanks
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Postby thedoctor » Mon May 19, 2014 9:05 pm

Could be a faulty diverter valve switching from hot water to heating and back again. Please let us know how you get on....Doc
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Postby mikezoe65 » Tue May 20, 2014 5:31 am

Had the work done and it turned out to be a blocked heat interchanger unit- not the diverter valve. Job cost £262 but the engineer said it would be possible to clear the unit of gunge and it would be reusable!
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