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Generally, the GEO 1 doesn't need a charge controller due to the size of the solar panel. GEO 2+ need a charge controller to stop the overcharging. We'd only recommend a charge controller for the GEO1 if you thought you'd frequently overcharge the battery.
It may be as a result of low charge in the battery. Leave the system off for a few days of good sun and then try again and see if the problem persists.
The panel strength isn't sufficient enough to warranty needing a charge controller. The controller is there to ensure there is no over-charge and this is not likely to happen on the smaller kits.
10A Solar Charge Controller
£39.99