Gas geyser not operating.

Atlas gas geyser 20L installed. Water / ignition goes off. Result no hot water . This is continuous.<br> Geyser sent to Atlas for testing. Came back no problems found. But was told it must have a flue and you can only use Duracell batteries. The flue was there and I don't buy the Duracell story. We nevertheless installed Duracell batteries, and geyser still switches off. Now what? They will not replace my geyser as they say it works. But in ideal test bench situation it will work. Johan will not come to the premises where the geyser is installed. <br> So this is for all those wanting to install a Atlas geyser, stay away, service is up to no good, actually non existent.