My ch system has been in for 15 years but is serviced regularly.
The boiler is a Potterton Suprima 30-80. Honeywell L641A cyl stat;
Siemens RWB2 programmer: Landis MA-V322 three port diverter valve.
I have no Room stats but each rad has a TRV fitted.
I have a problem with the domestic...
