PRECOR 956 TREADMILL KEEPS SHUTTING OFF. INITIALLY READ ERROR 21 BUT NOW COMPLETELY SHUTS OFF. TREADMILL IS REFURBISHED, NEW BELT NEW DECK, MOTOR APPEARS TO RUN FINE WITH NO LOAD (QUIET) ONCE I STEP ON IT (205LB) IT STRUGGLES
link for a manual above. It will help.
I would suspect the Motor, and or motor drive circuitry. This is the most common "Fault" If the "Motor" isn't directly faulty, then Often the "Speed Controller" that controls the motor, has gone faulty. all speed controllers, are prone to this type of thing. I really wonder if this type of problem is indeed home fixable? It is my professional opinion, that you get it looked at by a Precor Agent, and ask for a free "Quote" befor proceeding with any repairs, this way you can make an informed decision as to repair or replace. Read More At : Precor...