Potterton Suprima goes off

[Syty]

I was wondering if any of you had this problem and could give me advice.
I had a call today from a costumer about POTTERTON Suprima 60-80. He has two boilers installed, one for DHW and one for CH.
The CH one has to be reset every 24h, otherwise it stops heating. Once it's reset, works fine for another 24h +/- 2 hours.
They have had this problem since they bought the house (for over a year ).
I would suspect bad wiring or thermostat. I think it had PCB changed already.
I thought maybe anyone would have some more ideas to share before I go there.
thx

 

[Jamessteam]

PCB's are always going on those. Might be a idea to find out when it was changed. PCB's are the biggest problem on the suprimas.

 

[mfgs]

PCBV's are a weak point on these boilers to say the least, but you really need to find out at what point it is locking out.

 

[Syty]

thanx guys. I will check it out Tomorrow.