What does the yellow light mean on a braun series 7 shaver?

It is common for many Braun shavers, that if the indicator light flashes red while the shaver is being used (switched on and running), it means the battery is low and needs to be charged soon.

Below is an example from a manual for a Braun model 7526 shaver. You can search that site for other manuals if this is not the correct one.

This model shaver has 3 indicator lights:
1) Green (Charging)
2) Red (Low battery)
3) Blue (Power cord attached and plugged into the wall)

Download the manual for the model 7526 here: http://www.manualslib.com/manual/20281/Braun-5301.html#manual

"The green charging light shows that the
shaver is being charged. When the rechargeable
battery is fully charged, the charging light
flashes or goes off.

If later on, the charging light comes on
again, this indicates that the shaver is
being recharged to maintain its full
capacity.

The red low-charge light flashes when the
battery capacity has dropped below 20%,
provided the shaver is switched on. The
remaining capacity will then be sufficient
for 2 to 3 shaves."

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Try removing the foil and cutter head. Wait a few minutes and then refit them. It may be on some sort of electronic timer that after so many hours of shaving, the unit automatically comes up with a "change foil" icon and then wont let you use it until its replaced.

It appears that the battery needs to be replaced. shaveroutlet.com has the battery you need and installation video. They can also replace it for you
Braun Lithium Ion Battery for Pulsonic and Series 7 Model Shavers
Braun Series 7 Shaver Disassembly Tutorial Professional Battery Replacement for Most Models

The blades come mounted in the screen assembly. You will find this cartridge available at shaveroutlet.com. See link below

http://shaveroutlet.com/shaver-replacement-parts/braun-9000-series-pulsonic-foil-and-cutter-cartridge-p-365.html

These cleaning/charging units are prone to going bad. There are no parts for them, so, you will need to replace it.
You will find at shaveroutlet.com
Braun Series 7 and Pulsonic Clean Charge Base

Hello

Remove the electrical cord from the base of the shaver.

Press down and slide off the panel on the front of the shaver.

Remove the two nickel-plated batteries. Use these batteries as a guide to purchase new batteries at a hardware store or home repair store. Recycle the old batteries when finished. (Many hardware and home repair stores have battery-recycling stations.)

Put the new batteries inside the shaver and press gently to pop into place.

Place the front panel back on the shaver and plug the electrical cord into the bottom of the shaver. Connect to an electrical outlet to charge.

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This part is only available from a Braun repair center. You can call a repair center at 847-869-7755

here is the link to the manual and the service center http://www.braun.com/us/home.html