Where is the reset button on a invacare m51

It means the battery voltage has dropped below the operating range of the chair electronics. Either need new batteries or maybe a charger and new batteries. There is always a chance of loose battery harness connections.

You will need to contact a service tech in your area to do this. They should have a special programmer box that can adjust the settings on the chair to improve the chairs performance.

There is no reset button on a M51. It only has fuses. If it is turning on and it has blinking lights or if you have a joystick that has a display that says Press Reset then the chair needs to have an external reset plugged into it or the chair may need to programmed or serviced.

There is no reset button on a M51 chair. Invacare puts fuses in the battery harnesses. The manual may say there is a reset but trust me there is not.

Here's your M51 manual:
http://www.invacare.com/doc_files/1125085J.pdf
Trouble codes start at p25.
Also, Invacare is proud of the M51's wet-weather performance (check the "Rain Test" chapter in the manual. You might have a warranty issue. Check with an Invacare dealer.

If you have had swing away footrests on this chair you can replace them with model PHW93 and must ask to get them in red when you order them from a wheelchair store. If you dont know where a store is that sells Invacare products, call Invacare customer service at 800-333-6900.

The number of lights that are blinking indicate what the problem is. Visit this site to locate the type on controller on your power chair and you will be able to see that the blinking lights mean:
http://www.pgdt.com/scenter/diagnostics/diagvsi.html
Try to reset your manual brake release as this is a common problem.
If you continue to have a problem, contact your manufacturer or dealer for service. If your insurance purchased they power chair for you, they may also cover the cost of repairs.
Good luck!

the batters are charged but my chair dont come on

the batteries were dead

The circuit breaker is located on the base of the chair. It is a small button about half the size of a dime, and it often has a flexible cover over it. If it is tripped, you will feel a click when you push it as it resets.