radiators always come on with hot water only selected Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[andyl]

I have a coventional gas boiler,with a hot water cylinder and 3 way valve.The radiators get hot when i select hot water only on the digital timer.The hot water warms up gradually though a hot loop in the copper cylinder

[stoneyboy]

andyl,
Check the 3-way is free and working OK.
end