Jane,
I am no expert but have been on a very steep learning curve since Oct last year very much helped by many folk on here. Here goes:
I have a blown air heater in my VW - as Billy says, check you have the right gas supply for the current temperatures. The way it works is that one vent sucks in cold air and the other blows out the warm air once it has been through the heating unit (powered by the gas supply).
So by turning on the gas, setting the thermostat and operating the switch it should work.
As royell said the most common cause for failing to ignite is air in the gas pipes so keep repeating above to clear any air locks.
Don't expect instant warmth it does take a few minutes to get going.
Keep trying it took me days to figure out how to ignite the fridge!! Good luck!
Jane
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