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The time switch is external and the boiler works OK according to the display on the panel and I haven't spotted a thermostat anywhere.

I'm not sure, he didn't mention it - he opened up a box with a lot of wires; he said it was the central control box for the boilers.

Hello, I'm hoping someone can help me -I've just moved into a new house and the central heating is not working; all the radiators are cold - the hot water comes on OK and all the controls show that the boiler is working fine. The boiler is a Vaillant Eco Tech plus make and is newly fitted...