baxi boiler
 

Hi
Is there anyone that can help me with BAXI WM 381 rs boiler? had a new
gas valve and thermosat fitted but it now just run red hot as though
the sat is not picking any heat but the rads are very hot.
The guy that fitted them is at a lost, although the sat work fine
before (even had the old sat back in.
Would love some help on this
Thanks
Bob