3 way fridge - gas won't light

Could also be the selector hasn't quite turned the gas cock on in the valve, hence no gas out to light.

I wonder if he has the spark visible?

New bottle. Filled up and hardly been used.

I'm assuming you are level?
Can take a little time to build up pressure in the line to fridge, or so I have been told.

No, not totally level. On a small hill. There is gas coming through, though because I undid a nut in the gas line close to the outlet and the gas was flowing out.

Do you mean the exhaust outlet for the fridge flu, that comes out in the vent at the caravan's side.

Thanks. I will try this.

Bruce, you mentioned a faulty bypass button. What is this and where is it?

The bypass button is the one you press to get the pilot to light.
How it works is this, there is a device called a thermocouple or thermopile and its function is to shut off the gas when the pilot flame goes out. This is the safety device.

The button you press to get the pilot light going is a bypass to this thermocouple. You hold in this button till the little gauge on the fridge shows the needle going into the green section. What this is doing is allowing the flame to stay on till the heat has generated enough current in the thermocouple to hold the special gas valve open. We are talking a very small current here, something like 400 milliamps.

Now, what this means is that if you can get the pilot to light when holding the button in then there is nothing wrong with the gas supply however, if it will not stay alight then there are a few possibilities.
The first is that the thermocouple probe is not in the flame thereby not getting hot enough to generate current to hold the valve open
or............ the thermocouple needs replacing or........ perhaps there is an earth problem as stated above by one of the other responders.

There may be other causes but these are the ones that first come to mind.

The wasps in the flue problem, I've had that a few times, will only cause the fridge to not get cold as the heat flow up the flue is disturbed and does not function properly.
In this case the pilot flame will light and run properly but the fridge will not get cold. I recently had a wasps nest in the nephews van fridge which was out of sight, we had the fridge out and cleared the flue pipe but the fridge still did not work.

Eventually found a wasps nest just above the flame which was sending the heat everywhere but up the flue. This was only accessible from the back of the fridge while in situ and only then by removing the pilot cover plate and probing with wire.

Best way to avoid this is to make some cardboard covers for the fridge vents and keep them in place till you hit the road. Once the system is hot the wasps won't go near it anyway, besides, they are seasonal anyway.
Hope this helps.

Cheers, Bruce.

Thanks. Will try this.

That is for fridges that are running but not cooling!

The symptoms sound like a blocked chimney/flue, usually by mud wasps.

I think he is having problems getting it to light as opposed to not getting cold.
It could be a faulty bypass button or a blocked pilot jet, then again it may be the gas needs time to come through.

Thanks fellas. I will try these. And see how I go.