[Devonboy]

Welcome to the forum. As has been already stated the Secumotion looks to have been bypassed. probably because it was faulty & they are very expensive to replace. Hopefully there is a regulator attached to the top of the gas bottle in use as the Secumotion was the regulator. The Secumotion when used with two bottles needs a changeover valve, the Truma Duo Comfort range does this job, again very expensive. The hose from the bottle to the regulator would probably originally have been one with a crash protection, again very expensive to replace. The problem may be with the boiler or the supply may be turned off in the van. There should be a row of shut-off valves somewhere in the van to isolate each appliance. Truma product information here: http://www.southdownsmotorcaravans.co.uk/accessories/truma_drive-safe_secumotion.php