Whirlpool dishwasher won't wash in normal dry mode

Brand: Whirlpool

Model Number: WDF750SAYM

The dishwasher would not wash under most circumstances. The water fills up and is drained properly, but the wash cycle would only work when drying is set to “Eco” mode. Washing (when drying is set to Eco) works for both 1 hour wash and normal wash. What I’ve already tried:

• turn off power for a while, then back on
• Diagnostics returns 7-1, also returns 8-1 intermittently
• I’ve cleaned the spray arms and drain components, they’re working fine

Wet dishes aren’t great, it would be great to get this working under “Heated” drying mode. Got any ideas on things to try?

Thanks.