Central Heating won't turn off!

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19 Jan 2017
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Hi all,
I am in absolutely no way handy around the house, but hoping this is something I can sort myself...
I have a Vaillant EcoTec 615 system boiler, under 2 years old, pressure is within safe range and no warning symbols displayed. However, heating was stuck on as of last night and won't go off unless I actually switch the boiler off. Radiators too hot to touch. Thermostat is clicking at around 20 degrees but house at 29 - sweating! Switching central heating off on control panel in kitchen does nothing. A bit concerned as we have a young baby and room shouldn't be this warm!
Any help appreciated,
Cheers
Adam
 
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