Red warning light comes o

[breeze man]

I’m connected to the mains I have the 12 V leisure batteries on if I’m on site
After three days a warning red light comes on I have burstner solano t750

 

[RobbyMClark]

Any particular red light??

 

[maison]

I’m connected to the mains I have the 12 V leisure batteries on if I’m on site
After three days a warning red light comes on I have burstner solano t750

I’m afraid more specific information will be needed in order to make helpful suggestions.

 

[David and Sally]