Lunar Chateau, hot water not working !

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Hi everyone ,

Im hoping some one can help , we have recently bought a lunar chateau 500 2004 .

on our first outing everything worked ok after consulting the manuals for assistance but on our second trip the hot water would not run . we did everything by the book the same as the first time but after waiting for the water to pull through it just didnt
! it made the burbling noise like it did the first time but no water seems to appear , the cold works fine and i can only summise it is a blockage but with no previous experience with hot water systems in a caravan (our
previous caravan was a 1989 abi marauder )  thought i would ask for advice here first 

thanks in advance for any help