Braun Thermoscan 7 Error

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Author Metcalfe

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Aug 3, 2024, 10:10:31 AM8/3/24

to vilthisigpi

We have a Braun Thermoscan infra-red (IR) thermometer that has been working perfectly for about five years. It started complaining about low batteries and shutting off, despite me replacing with new batteries that I checked had plenty of charge.

When I opened it, I discovered that the batteries connect to the circuit board via simple metal clip contacts, and that the contacts had some corrosion on them, which was preventing power from getting to the board, hence why it was complaining of low batteries.

This image above also shows the contact points on the circuit board for the battery connection. This is where some corrosion had formed, and I could remove it simply by scraping lightly with a small screwdriver (the corner of a scourer would also have worked).

Same problem here with the bent contacts for the battery not making contact. Love this thermometer but being an electronics engineer and looking at the circuit board and overall design of how it powers up I agree with the comment that the design is poor for expecting a long term product life.

Our thermoscan had been working well, but I am not 100% sure if it is me or just in daylight (I tried using in a dark room). But the light stays on until the moment it gets a reading and then the backlight turns off immediately. Bit of a pain as that is when you want the backlight on! Anyone had similair problem? Also I put cheap coles batteries into it, but they are brand new, so still should be fine?

Hi Kevin, im having the same battery problem as yours in the same model. Trying to follow your fix, trying my best to open it, but once the screw is out, i dont know how to open it further. Im stuck. Can u pls help. Would love for u to put up a utube video so its easily follow able.

Wow, thanks Kevin, I followed your very helpful instructions and it solved the problem I was having with our 10-year-old Braun thermometer. Your instructions are quite clear and, in my opinion, better than following a YouTube video.

Thank you! You have been great help. Was kind of sad when I just could not get the Thermoscan 6022 to start up after changing batteries. Then I stumbled upon your article, followed your instructions and now it is working again.

Thanks Kevin as I followed your advice and my 6020 seems to be working again. It was saying lo then hi. I changed the batteries and then just got a constant error message or a reading of 41c! I was just about to throw it out when I found your advice. Followed it and it is working and giving realistic reads again. Thanks so much.

If soldering is not possible, then perhaps you could very carefully bend the clips (only a small amount) so that they rest on a slightly different part of the copper pad. Alternatively, kitchen foil could be used to increase the surface area of the clip.

Thank you so much for sharing this. I bought my thermometer in the US (I live in Korea) about 5 years ago and it stopped turning on recently. I thought I was going to have to shell out $100 for a new one here but I found your fix and it worked like a charm. Definitely good to have during this flu/corona virus season!

My approach would be to lightly tin what remains of the tab, and tin some multi-core wire. Then solder the tinned threads to the pad and snip them to leave fresh points of contact. You have to take a lot of care with damaged pads, not to rip them up.

The little red pin is essentially a push-button that should push in easily when the ear protector is attached. If yours is not pressing in, then it must be obstructed somehow. I would first try wiggling it carefully, to see if it could be freed up (tweezers might help).

My Thermoscan was coming up with the POS error all the time and when opened up realised the battery connectors were corroded. Scraped all the corrosion off and tried again but still kept giving the error.