If it were air in the gas pipe, the heater would not light at all. The fact it has lit shows that any air that might have got in to the supply pipe when the gas bottle was changed has now been purged out.
There should be no safety issue unless someone has been tampering or has damaged the appliance or flue. These appliances are designed to operate with Butane or Propane and whilst there are some small differences in the combustion process of the two gases this should not give rise to the symptoms you have described.
The symptoms suggest to me the flame is being baffled until it has taken the chill off the heat exchanger and flue. There can be a number of things that can give rise to this.
FIrstly, some caravans can suffer when the wind blows at some speeds in some directions. If this is the case the problem may disappear when the wind conditions change. you could move the caravan, even just a couple of meters can make the difference if there are buildings or big trees nearby. There might be some obstruction in the flue. It would be worth inspecting the roof cowl for dead leaves or spider webs etc The plastic top hat unscrews as these sometimes need replacing if they get damaged .
You do not tell us how old your caravan is, but gas appliances are not usually serviced as part of a normal service by a dealer. If the problem persists you should seek professional advice should and arrange to get the heater checked.
If teh caravan is covered by a guarantee, discuss the issue with the dealer.
All work on gas systems must conform to the the gas codes of practice Unless you are gas competent do not dismantle any part of the gas supply or flue pipes of the heater for your safety always refer such work to a component registered person.
There should be no safety issue unless someone has been tampering or has damaged the appliance or flue. These appliances are designed to operate with Butane or Propane and whilst there are some small differences in the combustion process of the two gases this should not give rise to the symptoms you have described.
The symptoms suggest to me the flame is being baffled until it has taken the chill off the heat exchanger and flue. There can be a number of things that can give rise to this.
FIrstly, some caravans can suffer when the wind blows at some speeds in some directions. If this is the case the problem may disappear when the wind conditions change. you could move the caravan, even just a couple of meters can make the difference if there are buildings or big trees nearby. There might be some obstruction in the flue. It would be worth inspecting the roof cowl for dead leaves or spider webs etc The plastic top hat unscrews as these sometimes need replacing if they get damaged .
You do not tell us how old your caravan is, but gas appliances are not usually serviced as part of a normal service by a dealer. If the problem persists you should seek professional advice should and arrange to get the heater checked.
If teh caravan is covered by a guarantee, discuss the issue with the dealer.
All work on gas systems must conform to the the gas codes of practice Unless you are gas competent do not dismantle any part of the gas supply or flue pipes of the heater for your safety always refer such work to a component registered person.
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