right then, my combiboiler switched off because the waterpressure was too low.

I've refilled it but it won't start up.
I can light the pilotlight manually but it won't stay on by itself and doesn't ignite the burners.

Now I've measured the thermocoupling to what I have been told it should measure wich is millivolts, between 10 and 15...? is that right?

Because if that is correct the thermocoupling is fine so it can't be that...

I have checked all the securities and they are fine (no resistance so circuits are closed).

relay of the gasblock is working, gassupply is fine, burners have been cleanned and pressure adjusted about 6 months ago.

I can't fucking figure out what's wrong and i don't want to admit defeat by rining a technician

I need hot water coz all this work has made me sweat...

So: any ideas what it may be and how does one measure the thermocoupling???