Valliant ECO BLUE 837 Water Cold

Boiler is fitted in first floor kitchen. Hot water changes to cold after about 5 min from hot to cold for 2 to 3 min in kitchen sink and shower on the first floor same happens during shower on 2nd floor as well. Engineer changed adapter valve 0020132682.
Problem is still not solved.
Please help

Andrew

Hi Andrew,

Without further information it is difficult for me to diagnose.  Are you seeing any fault codes?