This feels like a job for a professional, but since it's not critical I thought I'd take time to do a little research as to what the issue might be. I thought I had a decent understanding of the CH/HW system in my house but I'm flummoxed.
I have an open vented system with a h/w cylinder. Something in the H/W system isn't triggering the heating system (the circulation pump or the boiler) to come on. The CH works fine, so it looks like the boiler, pump and timer are all OK. What's more, the h/w stat seems to operate the Honeywell valve ok (so if the CH is on the water gets heated hence not a critical issue). I just don't get what could have failed.
Is that enough to go on?
I have an open vented system with a h/w cylinder. Something in the H/W system isn't triggering the heating system (the circulation pump or the boiler) to come on. The CH works fine, so it looks like the boiler, pump and timer are all OK. What's more, the h/w stat seems to operate the Honeywell valve ok (so if the CH is on the water gets heated hence not a critical issue). I just don't get what could have failed.
Is that enough to go on?