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Changed PCB, running smoothly for the past few days.. appreciate your help everyone

yeah i checked manually when i went to installer mode and display faults, no faul codes were displaying.. but if it clears it self after rebooting or something, then i have no way of knowing...

Same thing happens when CH is turned on, spases for few minutes before fireing up constanly... ordered a PCB, lets wait and see...

DHW does run at the set temp once its on... Boiler is 10+ years old now....

tried comfort mode off and setting down to 50c and still the same.... after a minute or 2 it start producing hot water.... i notice the lcd goes off and on very quickly when it start to fire up... also hearing a very slight humming noise from pcb.... not sure if thats normal... or a pcb fault?

all sensors were new, I'll try reducing theDHW temp to 50c. I also have Comfort Mode on... let me test...

Flowsensor was replaced 6 months ago, not necessoraliy needed replacing, was recommended due to slight pressure issue assuming there was a block somewhere, but pressure is as normal now. no issues there. all parts were new all was working until last week you dont get instant hot water, like now...

Hi fellow people, Help needed please I have a Vaillent EcoTec Plus 831 which when hot water is turned on, the boiler starts firing up and immediately glitches or resets or reboots very quick and cuts off heating up the water.. and leaving the water on, the boiler retrys and does the same thing...