My pronto m91 was flashing 5 times on the yellow led and after i resert it like you said it ran for a minuet and now it flashes 4 times on the bottom yellow led.

you can call the mfg for more info
or page 27
copy and paste

http://www.invacare.com/doc_files/1125038.pdf

Have the battery tested it must be failing.

Make sure that you are charging the chair 12-14 hrs before driving. charge with the joystick on, make sure both freewheel levers are in locked position.

I’m happy to assist further over the phone at https://www.6ya.com/expert/bill_bcbb89783b08c489

You are getting a motor error code. Check motor wiring and connection to the main control box. Motor may have gotten unplugged when changing the batteries.

Hello,

Seven blinks is most often the joystick. A Invacare Remote Programmer can be plugged in to the joystick to verify this.

This is a common problem with the M91 when the motors are more than several years old.
An error code of 4 flashes indicates a right motor fault. The right motor could have a short or open circuit, or a bad connection.
Check the right motor, connections and motor cable visually and with a voltmeter at the connector. Look for cuts, nicks and breaks in the wiring and for grease oozing out of the gearbox. Flip the seat back and remove the top cover. Disconnect the black square right motor plug and check the resistance across the red and black motor wires using a digital volt meter. 0 to 1.6 ohms is OK, anything out of this range is suspect.
If the motors are more than 3 years old, you should consider replacing the motor/brake/gearboxes as a pair, left and right. The motor/brake is about $650 with the motor/ brake/ gearbox assembly about $1,000 per side. Labor is 2 to 3 hours total. I usually replace the brake/motor/gearbox as a complete assembly to avoid future problems. Hope this helps.

truffles e-mail me at [email protected]. I need to know if you are getting any flashing lights on your joystick and are you hearing the brakes click when you move the joystick. Thanks

Your chair has a motor problem. The code does not tell which side it is. Make sure both motors have the brakes in the drive position before turning on the chair. Also check that both motors are plugged into the main control module in the base of the chair.

If it's the yellow battery light it will blink when the battery voltage is very low, too low to drive and lower than the red blink.

well,,, um try getting it a new power battery?