JCJC, I think we're onto something now.
The only way I can get the boiler to run is turn the room thermostat up so that clicks on, then turn the tank thermostat so that clicks on.
I can turn the boiler on or off by the tank thermostat but not the room thermostat. Does that point to anything at fault?
I'm a bit lost by your description, but yes, there is a junction box in the airing cupboard with loads of wires in! Two wires coming in from downstairs (timer swich and room stat?) and wires going to the tank stat, pump anf the 3 way valve thingy.
G
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