The Invacare Pronto M51 with a flash code of 6 indicates a right brake fault. This can mean several things and there are several solutions to this problem.
The brake lever can be in the wrong position and the brake can be in the release position. Work the brake lever up and down and see if this clears the fault and the chair drives.
There could be a bad connection from the motor to the controller in the base. Check the wiring for cuts and breaks. If you can get to the wiring plugs from the motor (there are two) check the connections and plugs for corrosion and a good connection.
To verify that you have a bad brake you need a digital voltmeter to check the resistance of the electromagnetic brake coil. It should be about 40 to 60 ohms across the two white connectors. You can check the motor at the same plug. If you have made these checks and the motor and brake test good then you have a bad controller output to that motor. This can be tested by swapping the motor outputs from the controller and see if the error code goes to the left motor output. The controllers run about $1000 retail and a technician can verify this a second time by taking a good known controller and plugging it in to see if the chair now runs.
In my experience if the motor/brake/gearbox assembly is more than 3 years old have it replaced. That being said, an experienced technician should verify a bad brake/motor/gearbox assembly first. On this chair, the only cost effective repair is to replace the entire brake/motor/gearbox assembly. The retail price is about $700. Keep in mind that if the right assembly is worn out the left is not far behind. Typically if insurance will pay for the repair, I opt to replace the left and right brake/motor/gearbox assemblies at the same time so you do not pay for the labor and inconvenience twice.
Try the simple fixes mentioned first, and then have a technician evaluate the chair for the other problems I have discussed. Hope this helps.
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