Lack
>> of volts means it isn't the pump.
>>
That's what I was heading towards. Seems odd it's just dead completely.
>> If you have hot water, I'm assuming (with a gravity system) it's relying on the
>> boiler thermostat to trip the boiler out out once the hot water is to temperature.
>> As you say the boiler won't fire up when CH is selected, is the boiler
>> still hot from (gravity) water heating (which would keep the boiler tripped-out)? If you're selecting
>> CH with a cold boiler and the boiler isn't firing up, the switching arrangements are
>> much more suspect than the pump.
>>
I was just trying that as I read your post. I'll drain some HW off and see if that does anything.
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