Recent content by Rattlymatt

It is a Y-plan system with a 3 port valve. I assumed the problem was the valve and I replaced the head yesterday, but it did not resolve the issue. I then noticed the programmer responded for the hot water but nothing from the heating controls. I am swapping the programmer with a like for like...

Thank you for your replies. It is a conventional boiler. Leading to an immersion tank. The thermostat programmer light will come on and there is a click to signal the hot water is on, but it heats the water and the radiators like the diverter is open for both. There is no response from the...

I have recently had issues with my central heating and water system. When the hot water is on, the radiators are hot. I thought this was the Honeywell Valve head, so I replaced it. Problem still there. I then spotted that the ST9420C programmer wouldn't fire the heating (the water was off) when...