Fisher & Paykel DishDrawer Code U3: filled too quickly or did not drain

What U3 means

On Fisher & Paykel DishDrawer DD605 series dishwashers, U3 means the tub filled too quickly or failed to drain. Prime was sensed in under twenty seconds, so the drawer drains and refills up to five times and then carries on. U3 is not shown to the owner. It sits in the history that a technician reads, though you might notice repeated draining and filling.

Common causes of U3

Water entering faster than expected
Drain that is slow or did not empty the tub
Drain hose kinked or partly blocked

✓ One safe check you can try

1. Check the drain hose under the sink for kinks. 2. Clean the filter in the bottom of the tub. 3. If you have a garbage disposal, make sure it is clear. 4. Watch a cycle. If the drawer keeps draining and refilling, call us.

! Why to stop there

U3 is only visible to a technician, so confirming it needs diagnostic tools.
The cause could be fill speed or drain, and we need to know which.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other DishDrawer & Dishwasher codes

F9Fisher & Paykel DishDrawer Code F9: power supply or controller error F30Fisher & Paykel Built-In Dishwasher Code F30: flooding switch activated F40Fisher & Paykel Built-In Dishwasher Code F40: water flow error F50Fisher & Paykel Built-In Dishwasher Code F50: electronics error F90Fisher & Paykel Built-In Dishwasher Code F90: data or electronics error FA0Fisher & Paykel Built-In Dishwasher Code FA0: electronics or power supply A70Fisher & Paykel Built-In Dishwasher Code A70: temperature sensing alarm FFFisher & Paykel DishDrawer Code FF: top tub not responding

U3U3 questions

Why can I not see U3 on my display?

U3 is recorded in the unit's history instead of being displayed. A technician reads it with a service tool, which tells us the tub filled too fast or did not drain.

What do I notice when U3 occurs?

The drawer may drain and refill several times, up to five, before continuing the cycle. That repeated filling is the unit trying to correct itself.

Is U3 the same as U4?

No. U3 is about fill speed or draining. U4 is an advisory that the other drawer on a double unit has an error. They are separate codes with separate checks.