Vokera Bolier fires up ok then bolier temperature drops

[jackd]

Hi can anyone advise what might be the problem with my Vokera boiler. It fires up ok boiler temperature show as 60 plus then after 10 to 15 minutes it goes to between 10 and 20 degrees. I then need to completely switch off the boiler at the mains then switch back on to restart it.

It then fires up ok but the same thing happens again.

Any ideas what could be wrong?

 

[easyflow]

Need a bit more info, model/combi ????

 

[jackd]

Thanks its a combi - model Syntesi 35.