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In most cases, AED units will just work. There's no problem with them. But if you do find that there's a fault in part of your routine checks, or you hear the unit doing something different or different lights flashing, you need to know what to do. The first most important thing, read the instructions thoroughly on your AED units now, but also look at them when you see any faults or audio messages so you know exactly what you need to do. What we'll do now is just briefly go over some of the features.

Now, on the unit, you have a normal flashing light on the front here. This is indicating that the unit is functioning correctly. While it's flashing, that's fine. If it's flashing and it's flashing red, that's obviously, red is danger. Therefore, it's indicating a problem. Also, it may well be that there are audio warnings as well. What can happen here? The light can flash red and it could indicate that the pads inside the unit and the battery need changing. Warnings there could indicate changes.

Also, the other time you'll get warnings is when you turn the unit on, and it may well come up with a message to say that the battery packs are very low or other warnings. Other warnings could be that you're using the unit, and it's saying the data is full. It may be if you've used this unit for a long period of time and EMS have not arrived yet and it may say that the data is full. What this means is there's a card inside that stores the data while you're actually using the unit, and this will only take a certain amount of data. Now, just because it says the data card is full, it only means from that point on, it's not recording any data. The unit will work perfectly well, so don't worry about that at all. When you download, you can also reset the data after you've used it, so that won't be a problem.

If the unit has not been used, you'll never get the data warning or alarm audios come on. So, it won't give any other notice on that. If when you turn the unit on, it gives a beeping, three rapid beep warnings, this can indicate that there is a problem with the temperature range. Now, it's important with AED units that they're stored correctly, and this includes temperature, which is why with some AED storage units, you'll have heaters in them, so it keeps them at a set temperature. Others in more extreme circumstances may have cooling systems built into them. AED units will only function within a set temperature range, which in general use, absolutely no problem at all. If it is giving this other warning, then it may be that the unit's being stored outside its operating temperature range.

When you're doing risk assessments and planning which AED unit and how you're using AED units, look at how you're storing the unit, where you're storing it, and check the instructions to make sure that you are storing it within that temperature range. It may be you'll use these units out in very snowy, very cold conditions and it just sat on a wall outside so you can get it quickly. That's where you may well need a heater in the unit. Even in standard UK conditions where it gets cold, again, heated units can be very good. Also, heaters will also prevent any condensation building up within the unit.

Also, when you do your self-test you might turn it on and it says that the unit needs a service. Now, there are no serviceable parts inside these units apart from the pads and batteries; so, they're the only thing you can really change. You can't open them up and fix anything, and if you do so you'll invalidate the warranty. If it does come up with a message saying that there's a problem and it needs servicing, you need to contact the place where you bought the unit from or the manufacturer to find out what you need to do. In some circumstances when this warning comes up, the unit can still be used, and other times, it can't, so you do need to check. So as soon as you get any warning that's saying about there's system fault with it, that's where you need to get that checked out.

And the units do this self-test. This is why they do it. This particular unit, at midnight every Sunday, it will do a check so that it can find out exactly what's wrong. It will self-test the unit, make sure if it's going well. This, again, is why we do regular checks, because it's all very well the unit doing these checks, but when you then turn the unit on, it will come up with the audio messages should there be any faults with the unit.