Know what you mean! My trouble now is which valve do I open to get the black arrow above 1! As you can tell, I haven't a clue about this.
Thanks everyone
Hi, we have the above boiler for hot water and CH in our 2yr old apartment. The red "lockout" light has started to flash on the Aztec unit beside the boiler when it fires up. We are in an apartment block but our boiler is different (the last apt to be built). A neighbour said when her light...