battery charge/electrical faulty Peugeot 307hdi 136bhp?

Basically what happens is that the climate control knocks off when it feels like it and comes back on in the same way. But the fault warning that comes on is battery charge/electrical faulty. There are know other problems when this happens i.e the windows radio and all other electrical components work fine. But when you switch the car off and then fire it back up the fault code has gone.