Error 654 on the Roomba® Max 700 Series Combo means the grey water dock tank level is too full. Please inspect the dirty water tank to see if it needs to be emptied.
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Remove the dirty water tank and see if there are any obstructions that could be blocking the tank from being fully installed.

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Lift the latch on the water tank to open.

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Empty Dirty Water Tank.

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Rinse the dirty water tank using warm water. Mild soap and a sponge may be used for stubborn debris.

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Close and latch the water tank lid.

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Reinstall the empty dirty water tank.
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Reboot the dock by unplugging it and plugging it back in again.
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Try washing the pad again.
If these steps do not resolve the issue, please contact iRobot® Customer Care for support.
For expedited service, please have the following ready: