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**Ingo** · 05-05-2008, 12:48 PM

When I came home last night I saw a Battery Controller Failure alarm on my keypad. When I did a battery test it keeps on giving me this error. I then switched the AC off and the whole system just died. I have 1 Master and 3 Slaves all with batteries and none of them worked. To fix this I had to press SW5 ( I think) on all 4 units to get the system running again - on battery power initially. After switching the AC on everything was fine again.

My question is, why do I have to reset the system manually to get it going again? This only happens once in a while, switching the AC on/off usually don\'t have any effect on the system.

Ingo

***admin*** · (This post was last modified: 05-05-2008, 01:41 PM by admin.)

When you have a Low battery alarm (\"Battery Warning\") it means that your main Comfort or slave battery is weak. If it is too weak and you swithc off the power then the system will switch off

If there is no power, connecting the battery will not switch on the system, this is a protective measure, until you press the battery switch near the heatsink. This allows the battery alone to power the system without the mains
However this is not necessary - you can just switch on the power without pressing the battery switch.

I suggest you measure the battery voltage on Comfort with the mains switch off so the system is on load. A good battery should be 12 V, if it is 11.5 volts or less then you have a weak battery, see the topic http://www.comfortforums.com/forum16/896.html

**Ingo** · 05-06-2008, 05:45 PM

I measured the battery voltages about 30 minutes after switching the AC off and they all read around 13.5v. I will keep an eye on the system to try and see what actually happens when this occurs. The problem is that it always happens (both times) when I am not at home.

***admin*** · 05-07-2008, 01:43 AM

13.5 Volts seems to high for the battery voltage. That is normally the voltage when it is being charged. A normal bettary voltae with be 12.0 to 12.5 V

**Ingo** · 05-07-2008, 05:54 AM

I also measured it when on charge - 13.8v give or take a few mV. The load is not very much, I have 14 PIR\'s spread over 4 panels, the rest are door and window switches. I can measure the current drawn but that will only confirm why the voltage is so close to the charging voltage even after 30 minutes on batteries. I do not suspect the batteries at all.

ggiannopoulos · 10-12-2009, 06:42 AM

When I start my Comfort without battery It has been a battery warning. When I reconnect the battery the warning still remains in the keypad . How can I \"reset\" the warning battery?