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I've recently had a new kitchen and extension completed on my house and since the works been completed I've lost all my heating and hot water. It's a Y plan system that i used to switch off and on (for heating) using the thermostat in the lounge, only because the programmer is buried at the...

Hi - I'm a newbie here so please be gentle! I've got a Honeywell Sundial "Y" plan system installed in my house (probably about 20 years old now) and this evening the heating's gone off! The thermostat in the lounge still clicks but it doesn't fire up the boiler. I can still get hot water...