Hi all. My gas combi boiler (Worcester Bosch 30CDi) feeds radiators in each room of my flat. As far as I understand it the boiler should only heat water (central heating water, I mean) when the electronic line from the thermostat is switched on, or in other words, calling for heat. This should be true regardless of the closed or opened state of any of the radiator valves. I have noticed however that my boiler fires up whenever I open a radiator valve even if the thermostat is set to zero and isn't calling for heat (I have tested the terminals with a multimeter so I know the 'stat is working correctly). The CH side of the boiler appears to function like the HW side, i.e. whenever a hot tap in the house is opened the boiler will heat the flowing water up.
I called the Worcester Bosch support line and they think this behaviour is impossible. Other than this the boiler functions perfectly and is only a few years old so I don't think it is faulty. Before I call out a plumber, does anyone have any ideas or experience with this? Perhaps it is configuration issue.
Many thanks
I called the Worcester Bosch support line and they think this behaviour is impossible. Other than this the boiler functions perfectly and is only a few years old so I don't think it is faulty. Before I call out a plumber, does anyone have any ideas or experience with this? Perhaps it is configuration issue.
Many thanks