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If its a Trauma just turn on the hot water tap until the water flows without any spluttering. turn off and then the heater is ready to be lit.Draining is bit like the same in reverse open the cold water tank drain and turn on the hot water tap until no more water flows.

What year is the van? Our Hymer B534 has a Trume, and that has a red valve that you push down to drain next to the boiler. Our main water tank is under one of the loiunge seats which you fill from the outside, has your van a filler cap for water outside, if so the tank should be inside somewhere near that filler.

You light the water heater by making sure the gas is turned on at the bottle, the automatic changeover if fitted is on, the gas isolation knob (probably in a cupboard by the sink) is on, then use the switch.

to fill the boiler you point the mixer to hot and open the tap, when it stops spluttering and water runs smooth the boiler is full.

Think your next step is to check it's gettign gas, we only get the red light when it fails to start becuase we havn't got the gas turned on.

Check gas on a the bottle, the isolation knobs in the van are turned the right way, ours didn't have any off/on labels so once we figured it out we stuck some on.

Also find that after we have changed a bottle it takes a while to get the gas through to the heater, find that by lighting the stove for a few seconds helps the gas through the system.

Andy

thanks again for your latest suggestions, checked water and gas both seem ok as water running smoothly, heater, cooker and fridge all working too.

Isolation knobs, are those the 4 just above the drain valve? They're all running along the pipes and as everything else seem to be working I take it they're the right way.

When I switch the boiler on I can hear a click then a short pause another click and the red light comes on then too.

Any other ideas? Prob still something I'm not doing right!

In our van the isolation knobes are oval shaped red knobs with poictures of a Snowflake for the fridge, saucepan for the cooker and a stove for the heater/boiler (we have blown heating, no seperate fire).

If you are sure you have gas getting to the boiler the red light then means it is failing to ignite, so there could be a fault with the igniter system, not sure how to check that, maybe you could try here: http://www.trumauk.com/products/water/ as they have some schematics of the waterheaters, may be also worth a quick email to them.

Andy good idea, I'll try an email to truma see what they come up with

Cheers

thanks for that, turns out that's exactly what we were missing we found that out by accident on friday when we took the cover off!

looking forward to the next trip now gonna post another query in a new thread now, maybe someone can help us with that too?