1) reverse circulation sounds about right, so if the 3 way is faulty, it would let this happen? I'm pointing out that it may be 25 yrs old and appeared to be working ok 4 weeks ago.
2) correct, the rads get hot when only the HW is turned on, the valve is a honeywell.
I might be sounding...
Hi,
I'm a newbie here, and can handle many DIY situations.
We have just moved into somewhere new and I'm having trouble understanding the central heating system. It's a Halstead 'hero' boiler in an open vented system incorporating a 3 way valve which may be the cause of my problems. The house...