You can buy a cheap one from a DIY shop for £5 - £15.A multimeter on ebay costs around £40.00
Is there a timer, programmer or other control?Inexplicably the CH is has come on and the green led on the boiler is on as well
OK now you know the red and yellow wires control the central heating, I wonder if there is a timer or some thing else which had lead you astray?Inexplicably the CH is has come on and the green led on the boiler is on as well
The red wire is connected directly to the yellow wire with no thermostat
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