treadmill control board help

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Joined Jan 18, 2022
My treadmill stopped working. I can run the motor off a 20V battery and it works fine. control board (yq-01v01-20191016) with 90V DC output. I can When I connect voltmeter to control board DC output (motor is unplugged) it starts at 30V and just goes up and up and up finally stops around 110V DC. the speed settign on treadmill (assume it should lower/raise the voltage) does absolutely nothing.
If I connect the motor the voltage drops very rapidly an the board relay shuts off with error LED lit.
Everything else on treadmill seems to work (remote, LED, on/off , sound etc.)

Any help appreciated. Steve