worcester 15/19 hot water lacking

[ben5192]

Hi guys/gals
Iv been outa worcester 15/19 today, customer turns on hot water on programmer, boiler fires, heats up store no prob(no heat to rads-diverter seems ok) 12 mins and reaches temp and turns off- all fine but,

after 1 shower and waiting 15 mins second shower is nothing like warm enough....
any ideas,
thanks in advance
Ben

 

[Bunker]

Maybe the store stat isnt recognising the temperature drop or getting stuck to satisfied? Id be checking that. Easy enough with a meter. BTW, most people run combi's on permanent DHW.
Ring WB with a meter in your hand (assuming you are competent etc), very helpful.