Away in France the temperature plummeted overnight so at 6 this morning I put the Alde heating on gas to take the chill off. It's a 3020 in a 2017/18 van. Other than testing the system on electric a while ago and using it regularly for hot water only it's the first time it's been used for heating so I wasn't really surprised when it seemed like some of the radiators needed bleeding but the van slowly warmed up. However at 7.30 the system switched itself off. The control panel was dead, wouldn't turn on and I thought a fuse must have gone or the panel was faulty when suddenly it switched itself on and started working again. I didn't touch it and it was off for maybe 20 minutes or so. Any ideas what could be the problem? Thanks.