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Mend Vaillant Only Hot Flow

Vaillant turbomax only hot on slow flow?

Hi I have a Vaillant Turbo Max that is only heating water to 40 degrees on full flow. If you turn the tap down to a dribble it will heat upto 60+. Aprreciate any advice

alan
June 2013
VaillantHeating, Home Heating SystemsOnly Hot Flow
could be the aqua sensor unit, located at bottom right hand corner of the plate to plate heat exchanger

dave e
June 2013
clean hot water heat exchanger also change NTC hot water

ltd
June 2013
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Vaillant ecoTEC 831 Plus

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